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Marker Wadden
Marker Wadden
Marker Wadden
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Artificial islands of the Markermeer
1 = prototype
2 = Trintelzand [nl]
3 = Marker Wadden
in pale = proposed islands (in 2022).

Key Information

The first island seen from an airplane in 2017, still a virgin island

The Marker Wadden is an artificial archipelago developed in the Markermeer between 2016 and 2021, a lake in the Netherlands. The first island was inaugurated on 24 September 2016.[1] It is a nature reserve alternative to the much bigger proposed Markerwaard polder that was begun in 1941, but paused following World War II and finally canceled in 2003.

Project

[edit]

The project was proposed in 2012 by the Vereniging Natuurmonumenten.[2][3][4] The Dutch government, BirdLife Netherlands, ANWB, and VNO-NCW are partners in its development.[citation needed]

Work on the first phase, which is mainly focused on the construction of the first island, started in April 2016,[5] with Royal Boskalis being awarded the contract.[6]

The main aims of the project are to create breeding grounds, islands, and coast line as well as to improve the water ecology of the Markermeer. The project creates a wetland comparable with the Wadden Sea—hence the name of the project—yet without tides. This is because the Markermeer is not connected to the sea and is in a fresh water environment. The nature reserve is accessible to tourists.[7] There is a ferry service from the city of Lelystad, itself a city built on reclaimed IJsselmeer land.

On 11 May 2016, the first new island was completed, Natuurmonumenten called this a "milestone". In March 2017, it was announced that four other islands should be completed before 2020.[8][needs update]

Flora and fauna

[edit]

The islands have been colonized by large numbers of breeding birds. A colony of 200 breeding pairs of pied avocet has made the islands their home, as has a large colony of common tern. Little terns also breed on the islands. Northern shoveler, gadwall, garganey, Mediterranean gull, spoonbill, long-tailed duck and numerous other species of birds have been seen on and around the islands.

Participants

[edit]

Contributions: Dutch government €19,000,000.[1]

Controversy

[edit]

The ecologist Wouter van Dieren [nl] claimed he first had the idea in 1996 and talks about "plagiarism".[9]

Events

[edit]

In March 2024 Marker Wadden was the focus of a 50-strong scientific ecological conference investigating aspects of water ecology and coastal science organised by the Netherlands Centre for Coastal Research.[10]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Marker Wadden

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The Marker Wadden is an artificial in the , a large freshwater lake in the central , designed as a major ecological restoration project to counteract the lake's caused by historical and water management. Comprising islands, marshes, and mudflats built from dredged sand, clay, and silt sourced directly from the lake, it aims to enhance , improve by reducing , and create vital habitats for birds, , , and in a region designated as a . One of the largest such initiatives in , the project targets the restoration of up to 100 square kilometers of natural landscape, serving as a model for sediment-based habitat creation worldwide. Construction of the Marker Wadden began in spring 2016, led by a public-private partnership including Natuurmonumenten, , and contractor , employing "Building with Nature" principles to integrate engineering with ecological processes. The first phase, completed by 2023, produced seven islands covering about 1,300 hectares, utilizing approximately 12.5 million cubic meters of sand and 15.5 million cubic meters of clay and silt dredged from the lakebed. A harbor island with public facilities, including a boat landing, , and eco-friendly settlement, opened to visitors in 2018, promoting recreational access while minimizing disturbance to the developing ecosystems. Ongoing phases and maintenance, supported by the Dutch government and EU funding, continue to expand and monitor the site as part of Nieuw Land National Park. Ecologically, the Marker Wadden has shown rapid and promising development, with five years of research under the Knowledge and Innovation Programme (KIMA) revealing enhanced habitats that have attracted over 47 bird species for breeding and migration (as of 2021), including the , , and , as well as diverse aquatic plants like pondweeds and stoneworts. Fish populations, dominated by common species such as and pike, benefit from nutrient-rich shallow zones ideal for spawning, while water quality improvements include clearer conditions in lee-side areas due to the annual capture of around 250 kilotons of silt, boosting chlorophyll levels for . By 2024, the project had hosted international scientific conferences on water and initiated KIMA 2.0 for continued monitoring through 2026, confirming its role as a and a scalable solution for addressing and loss in similar freshwater systems globally; as of 2025, monitoring continues to affirm positive ecological impacts.

Overview

Location and Geography

Lake Markermeer is a large, shallow freshwater lake in the central , formed in 1976 by the construction of the , a 27-kilometer-long dike that separated it from the adjacent . This dike, completed between and , transformed the former estuarine area—originally part of the —into a more enclosed freshwater body, reducing tidal influences and freshwater inflows. The lake covers a surface area of approximately 680 km² and has an average depth of 3.6 meters, with depths ranging from less than 1 meter along the shores to about 5 meters in deeper sections. The lake's is characterized by limited water exchange, leading to the accumulation of fine on the bottom, which are predominantly and clay particles derived from river inflows and historical estuarine deposits. Wind-driven waves frequently resuspend these , resulting in persistently high levels that limit light penetration and disrupt aquatic ecosystems. This dynamics issue stems from the lake's shallow profile and isolation from marine influences, which once provided scouring flows to prevent excessive settling and maintain ecological dynamism. Marker Wadden is situated in the northeastern portion of Lake , approximately 10 kilometers offshore from the city of in the province of , within the broader region. The project's coordinates are centered around 52°35′N 5°22′E, placing it amid the lake's open waters. The initial phase encompasses about 1,000 to 1,300 hectares, including a series of artificial islands and surrounding shallow zones designed to integrate with the lake's .

Purpose and Objectives

The Marker Wadden project aims to restore in the by constructing a series of artificial islands and shallow areas that mimic delta formation processes, thereby creating diverse habitats for aquatic and terrestrial . This initiative addresses the lake's ecological degradation, characterized by high from suspended sediments that limits penetration and , by trapping in designated zones to improve and foster the development of underwater ecosystems. Additionally, the project seeks to enhance by providing sheltered spawning and nursery grounds, benefiting both the and the local fishing industry. Secondary objectives include expanding recreational opportunities through accessible nature areas, such as a public harbor and visitor facilities, to connect people with the restored landscape while promoting . The project also serves as a scalable model for to combat climate change impacts, such as rising sea levels and habitat loss, by demonstrating innovative sediment management and ecosystem resilience strategies. These efforts specifically counteract the environmental decline triggered by the construction of the , which isolated the and disrupted its natural sediment dynamics, leading to a turbid, low-biodiversity "dead lake." The overall plan targets a total area of up to 100 km², with approximately 50 km² emerging above water as islands and marshes, while the initial phase encompasses about 1,300 hectares across seven islands to establish foundational ecosystems. These self-sustaining habitats are projected to mature within 10-15 years, supporting long-term ecological stability and contributing to broader goals like the network for protected species.

History and Development

Planning Phase

The planning phase of the Marker Wadden project originated in the early , when the Dutch nature conservation organization Natuurmonumenten identified the need for intervention in the following studies that documented the lake's severe ecological decline, including accumulation, reduced , and poor due to its isolation from marine influences after the 1976 dike construction. These assessments, conducted by environmental researchers and government agencies, revealed how wind-driven resuspension of fine sediments had created a turbid environment hostile to aquatic life, prompting Natuurmonumenten to explore large-scale restoration strategies. By the late , this led to collaborative discussions with hydrological experts to conceptualize sediment-based solutions for creation. In , Natuurmonumenten developed a plan in collaboration with partners including Royal HaskoningDHV, which outlined the innovative idea of constructing an of islands using dredged lake sediments to foster natural processes, improve , and restore ecological connectivity in the . This vision emphasized "building with nature" principles, aiming to mimic historical wetland dynamics while addressing the lake's ongoing degradation without relying on chemical treatments or mechanical alone. The plan gained traction among stakeholders, setting the stage for more rigorous preparatory work and aligning with national goals for protected areas. From 2012 to 2015, comprehensive feasibility assessments were undertaken, including environmental impact studies (EIA) led by , the Dutch Ministry of Infrastructure and Water Management. These evaluations incorporated hydrological modeling to predict sediment flow and island stability, sediment composition analyses to ensure viability for construction, and cost-benefit analyses weighing ecological gains against engineering expenses, ultimately demonstrating the project's potential to enhance while managing flood risks. The EIA report, published in 2014, addressed potential impacts on water levels, navigation, and adjacent ecosystems, facilitating regulatory compliance under directives. Government approval came in 2015, when awarded the initial tender to a consortium including , Witteveen+Bos, Vista, and , marking the transition from planning to execution while securing partial funding from the national Delta Programme. Early milestones included 2014 pilot tests on nourishment, such as experimental to observe recolonization by and , which validated the use of local mud for island building. In 2016, formal partnership agreements were established between Natuurmonumenten, , and the Province of , solidifying governance structures and preparatory dredging protocols ahead of full-scale development. This phase's success in integrating scientific research with policy advocacy exemplified in Dutch water restoration efforts.

Construction Timeline

Construction of the Marker Wadden project commenced in March 2016 with initial operations to form the islands using from the . The first phase, spanning 2016 to 2021, focused on constructing five islands and surrounding shallow areas totaling approximately 1,000 ha, utilizing about 12.5 million m³ of sand and 15.5 million m³ of clay and silt dredged from the lakebed. The first island became accessible to visitors in 2018. This milestone marked the project's early success in creating new habitats. Phase 2, from 2019 to 2023, involved further expansion of shallow areas and construction of two additional islands, alongside the completion of access infrastructure. These efforts contributed to the full opening of the initial seven islands, totaling 1,300 ha, to the public in 2023. Delays occurred due to the , which impacted logistics and on-site activities. As of , infill work continues to refine the landscape, with ongoing monitoring of ecological development. The initial phases of the project were completed in 2023.

Design and Engineering

Methods and Techniques

The construction of Marker Wadden primarily relies on sediment nourishment, where fine silt from —characterized by particle sizes less than 63 μm—is dredged from the lake bottom and pumped as a to form islands and shallows. This process creates ecological gradients transitioning from deep lake waters to emergent land, fostering diverse habitats through layered deposition of the dredged material into compartmentalized areas bounded by temporary sandy ring dykes. Cutter suction dredgers extract the sediment, which is then transported via pipelines and discharged in thin layers to promote even settling and minimize erosion during initial placement. Central to the project are "building with nature" principles, which integrate natural processes into engineering to enhance long-term resilience without relying on conventional . EcoShape's Knowledge and Innovation Programme for Marker Wadden (KIMA) exemplifies this approach by employing methods to construct stable landforms using local and , allowing natural to consolidate the deposits over time. Unlike traditional island-building, no permanent dikes or reinforcements were installed initially; instead, the design depends on organic stabilization through vegetation growth and wave-induced accretion, with sandy margins providing interim protection against lateral . This adaptive strategy has enabled the formation of self-sustaining marshes and shallows, where repeated nourishment cycles build elevation progressively until land emerges above the . Hydrological modeling played a crucial role in ensuring the viability of these techniques, with simulations predicting water flow patterns, , and overall to support stability. These models, developed through the KIMA programme, analyzed factors such as segregation during deposition—where coarser settles near discharge points and finer particles distribute outward—and the impacts of lake currents on and . Results indicated that the constructed features would trap suspended s, reducing resuspension in adjacent waters while allowing controlled consolidation, with rates slowing after initial phases due to natural crusting and rooting. protocols, informed by real-time monitoring like drone surveys and sediment profiling, enable ongoing adjustments to counteract and maintain the intended hydrological gradients.

Materials and Construction

The primary material for the Marker Wadden islands is locally dredged from the bed of , consisting primarily of fine , clay, , and . This material, which has accumulated in the lake since its creation in the , is used to minimize environmental impact by avoiding the import of external resources and repurposing excess lakebed deposits that contribute to water . The is characterized by a high content, typically around 70-90% of being inorganic , with the remainder including clay and fine fractions suitable for formation. Construction logistics rely on specialized dredging equipment operated by and , including cutter suction dredgers and trailing suction hopper dredgers to extract and transport the sediment. These vessels suction the material from designated pits in the lakebed and employ rainbowing—a technique where the sediment-water mixture is sprayed over the construction site to facilitate even deposition within containment structures like sand ring dikes. For Phase 1, which encompasses the creation of seven islands covering approximately 1,300 hectares above and below the waterline, approximately 28 million cubic meters of sediment (12.5 million m³ of and 15.5 million m³ of clay and ) was utilized, forming the core fill for the islands while deeper channels were excavated to trap additional silt. Post-deposition, harbors and access trails were constructed to support monitoring and limited public access, with the process beginning in 2016 and completing the initial islands by 2023. On-site building processes involve layered deposition of the dredged to achieve desired elevations, reaching up to 2 meters above the lake for stability against wave action and to create diverse habitats. The is allowed to consolidate naturally underwater before additional layers are added, promoting gradual settling and integration with the surrounding . Following island formation in 2018, initial vegetation planting occurred between 2018 and 2019, incorporating local species such as common reed () and cattail () on designated areas to accelerate ecological stabilization and support development. This planting was guided by eco-engineering principles to ensure compatibility with the fine-grained substrate.

Ecological Impact

Flora and Vegetation

The establishment of in the Marker Wadden began with targeted initial planting efforts from 2018 to 2020, focusing on to stabilize the exposed sediments of the newly formed islands and shallows. Over 200,000 individuals of species such as common reed (), sea club-rush (Bolboschoenus maritimus), and various willows (Salix spp.) were introduced via sowing, transplantation, and protective enclosures to prevent damage and promote rapid rooting. These efforts were essential for binding loose and initiating in the nutrient-rich but barren substrate. Natural succession has since driven a marked diversification of , transforming the initial sparse cover into a of habitats. By 2023, the shallows host submerged and floating aquatic plants, including water lilies ( spp.) and pondweeds ( spp.), while higher elevations support emergent marshes and grasslands dominated by sedges and grasses. coverage expanded substantially in monitored plots, rising from about 10%–18% in to 65%–96% by 2023 in natural development areas, reflecting the accumulation of and reduced wave exposure. This progression aligns with broader objectives by fostering layered plant communities that enhance nutrient cycling and structural complexity. The developing exhibits adaptations suited to the dynamic freshwater environment, including tolerance to fluctuating levels and occasional residual from historical influences in the lake . Salt-tolerant pioneers like sea club-rush persist in transitional zones, aiding accretion, while later successional species such as bulrushes and forbs contribute to habitat connectivity. Ongoing monitoring has documented over 170 species as of 2022, spanning herbs, aquatics, and shrubs, which collectively bolster across the ; a 2025 study noted greater diversity in naturally developing areas compared to actively restored plots.

Fauna and Wildlife

The Marker Wadden has rapidly become a vital breeding and staging for numerous , transforming a previously barren area into a thriving avian hotspot. Since construction began in 2016, pioneer breeders such as the (Sterna hirundo) and (Recurvirostra avosetta) were among the first to colonize the islands, with the (Platalea leucorodia) and black tern (Chlidonias niger) establishing significant populations for foraging and nesting. The (Anser anser) also utilizes the area for breeding and resting, contributing to the overall waterbird diversity. By 2021, the breeding bird community encompassed 47 , with approximately 10,000 breeding pairs recorded across the , a marked increase from zero prior to the project. These bird populations benefit from the diverse habitats created by the islands' shallows and marshes, which provide nesting sites and abundant food resources from emerging aquatic life. Monitoring efforts, including the , have documented high breeding success rates for species like the black tern and , with tens of thousands of migratory waterbirds, including over 60,000 individuals in 2020–2021, using the site as a stopover. The project's supports over 1% of international populations for certain , such as the (Spatula clypeata) and (Aythya ferina), enhancing regional . A 2025 study confirmed positive impacts on regional and waterbird populations through 2021 data. Aquatic life in the Marker Wadden has seen substantial growth due to the engineered shallow zones and sheltered bays, which offer spawning grounds and refuge for . Common species including (Perca fluviatilis) and pike (Esox lucius) have shown increased presence, with young-of-the-year densities peaking in nutrient-rich wetlands and mudflats. These habitats have boosted overall abundance by providing structure that reduces predation and enhances recruitment, leading to higher biomass in the local compared to the surrounding . Invertebrates, such as water fleas ( spp.), have proliferated in the clearer, plant-supported waters, serving as a foundational prey base for and birds. Mammalian colonization remains in early stages, with the project's wetland features designed to attract species like the (Castor fiber) and (Lutra lutra), though confirmed sightings are limited as of recent monitoring. Insect diversity has notably expanded, with a wide array of species—including beetles and aquatic larvae—settling in the developing vegetation and shallows, supporting and serving as prey for breeding birds. Ongoing research indicates steady increases in insect assemblages since 2018, further enriching the ecosystem's trophic levels.

Water Quality Improvements

The Marker Wadden archipelago promotes sediment settling in its shallow zones, significantly reducing turbidity by trapping fine particles that would otherwise remain suspended in Lake Markermeer. Prior to construction in 2016, suspended particle concentrations in the lake typically averaged 30 mg/L, with peaks exceeding 100 mg/L during windy conditions that resuspend bottom sediments. By 2022, the project's silt capture mechanisms— including channels and borrow pits—had trapped approximately 200–250 kilotons of mud annually, resulting in a lake-wide decrease of 1–2 mg/L in suspended solids, with more pronounced local reductions in sheltered areas to around 20 mg/L or lower as of 2023. This enhanced light penetration, with secchi depths increasing in lee-side zones, supports greater photosynthetic activity among aquatic plants and algae. Nutrient dynamics have also improved through natural filtration in the shallows, where sediments bind and settle , reducing its availability for excessive algal growth. Initial post-construction measurements showed elevated concentrations inside the due to sediment release—up to 6.3-fold higher total than in open lake waters in 2018. Ongoing monitoring under KIMA 2.0 (2023–2026) continues to assess long-term reductions. Concurrently, oxygen levels in the shallows rose by 15% as of 2022, driven by boosted and decreased organic matter decomposition from settled sediments. Long-term modeling indicates sustained over the approximately 20 km² influenced by the 10 km² , with 2023 monitoring data revealing positive ripple effects extending to adjacent lake regions through reduced export. These enhancements underscore the project's role in restoring hydrological balance, with ongoing observations confirming persistent improvements in chemical parameters beyond initial construction phases.

Stakeholders and Governance

Key Participants

The Marker Wadden project was initiated and is primarily managed by Natuurmonumenten, the largest private organization in the , which oversees nature management, public engagement, and long-term maintenance of the islands. As the project's driving force, Natuurmonumenten coordinates restoration efforts and ensures the islands support in Lake . Rijkswaterstaat, the executive agency of the Dutch Ministry of Infrastructure and Water Management, serves as the governmental water authority responsible for project approvals, oversight, and integration with national flood safety standards. It focuses on enhancing and safety, collaborating on programs like the Knowledge and Innovation Programme Marker Wadden (KIMA) to monitor development. Boskalis, a leading Dutch maritime company, acts as the primary and contractor, handling the extraction and placement of to build the islands using Building with Nature techniques. It led the that completed the first phase, including ring dikes, beaches, and sediment traps, in partnership with design firms. Supporting the project through engineering consultancy are and Deltares, which provide expertise in design, , and hydraulic modeling to ensure the islands' stability and ecological functionality. contributed to natural feature designs like dunes and mudflats, while Deltares coordinates research on sediment dynamics, governance, and climate adaptation via KIMA 2.0. The Province of , as the local government authority, issues permits, manages , and enforces laws to align the project with regional development goals. Scientific input comes from Wageningen Marine Research, part of , which studies ecological impacts and dynamics in collaboration with other partners.

Funding and Financing

The Marker Wadden project has been supported by a mix of public and private sources, reflecting its status as a collaborative ecological restoration initiative. The initial construction phase, covering the development of the first islands from onward, had a of approximately €78 million. This was allocated primarily from the Dutch national government, which provided about €36.7 million (47%) through the Delta Fund and related budgets managed by the Ministry of Infrastructure and Water Management. Provincial contributions from and added €10.9 million (14%), focused on enhancing regional recreation and economic benefits. Natuurmonumenten, the primary driving the project, contributed roughly €30.4 million (39%), sourced from a combination of efforts, member donations, business sponsorships, and a significant €15 million grant from the Dutch National Postcode Lottery's Dream Fund. These private funds were crucial in matching public investments and accelerating the first phase, which included the creation of over 1,000 hectares of new habitats. The overall budget for the project's initial phases through 2026 is estimated at €225 million, encompassing construction, monitoring, and expansion activities. EU funding through programs like LIFE was initially anticipated but ultimately not secured for the core construction. In recent years, innovative financing options have been considered to sustain long-term operations. As of August 2025, public-private partnerships have played a key role in addressing financial challenges, facilitating additional investments in ongoing ecological monitoring and without specified new allocations beyond existing frameworks. A 2025 study identified 12 key strategies that enabled funding for the Marker Wadden, serving as a model for overcoming financial barriers in ecological restoration projects. Key participants such as oversee fund disbursement to ensure alignment with project goals.

Controversies and Challenges

Environmental and Ecological Concerns

One key environmental concern surrounding the Marker Wadden project is the risk of unintended sedimentation and increased turbidity beyond the designated construction zones. The 2015 Environmental Impact Assessment (EIA) anticipated that sediment extraction and island building would primarily contain silt within project-specific channels and pits, predicting minimal lake-wide spread by trapping approximately 200 kilotons of mud annually in these features. However, subsequent monitoring revealed that dredging and construction activities generated silt plumes, temporarily elevating turbidity in adjacent areas through sediment resuspension and nutrient release, which could exacerbate silting outside the archipelago during windy conditions. Biodiversity trade-offs represent another scientific critique, particularly the initial displacement of open-water species during the construction phase. Dredging operations from 2016 to 2021 disrupted benthic communities and pelagic habitats in Lake , temporarily displacing fish and adapted to the lake's turbid, open-water conditions as plumes altered light penetration and oxygen levels. Ongoing debates question whether the artificial islands fully replicate natural dynamics, as engineered habitats may favor colonizing and bird species—such as terns and avocets—while potentially reducing suitability for open-water adapted organisms due to increased structural complexity and altered flow patterns. Climate vulnerability poses additional challenges for the low-lying islands, given their reliance on managed water levels in a freshwater lake system. Although protected from direct marine influences by the , rising regional water levels due to sea-level rise could inundate shallow zones, accelerating or in silt-based structures that have already experienced up to 1.7 meters of consolidation. Recent assessments emphasize the need for adaptive designs, such as enhanced monitoring of accretion and stabilization, to mitigate potential loss from increased flooding or temperature shifts in this engineered ecosystem.

Public and Political Opposition

The Marker Wadden project encountered early opposition from the in the , primarily due to anticipated restrictions on lake access and activities in the newly created protected zones. Fishermen argued that the artificial islands would limit traditional netting and practices in the , reducing their operational space and potentially impacting livelihoods. This led to protests and negotiations, culminating in 2014 compromises that designated specific zones for continued while prioritizing ecological restoration. Local farmers also voiced concerns during the project's phases regarding potential changes to levels in the surrounding polders. They feared that the islands' construction and associated could alter hydrological balances, leading to higher levels that might flood agricultural lands or affect irrigation in and adjacent areas. These worries were amplified by broader debates on , with critics arguing that converting potential farmland into nature reserves unnecessarily prioritized ecology over production needs. Political debates further delayed the project, particularly following the 2015 provincial elections in , where shifts in the political landscape prompted renewed scrutiny of funding allocations and environmental permits. The elections resulted in a fragmented , stalling approvals as parties debated the balance between nature restoration and . This contributed to postponements in key decisions, including the tender process for construction. Recent public concerns from 2023 have focused on the impacts of growing , with visitors reaching around 50,000 annually and contributing significantly to costs. While the project has boosted recreational access, some residents and stakeholders raised issues about overcrowding potentially disturbing wildlife.

Recreation and Access

Visitor Facilities

Access to the Marker Wadden is provided primarily through ferry services departing from Bataviahaven in , offering a 45-minute journey across the to the main island, Haveneiland. Private boats and chartered vessels can also reach the natural harbor on Haveneiland, which includes 26 moorings and a dedicated accommodating up to 12 boats. Parking facilities at Bataviahaven support visitor arrivals, with options such as the covered VOC Parking Garage at €10 per day and outdoor lots at €3.50 per day. The Island Pavilion serves as the primary on Haveneiland, providing information on the project's ecological restoration efforts through exhibits and a terrace overlooking the landscape. Approximately 10 kilometers of walking trails and boardwalks traverse the island, connecting key natural features and viewpoints. Several observation towers, including the elevated Steltloper tower, and multiple hides enable unobstructed views of the developing habitats and wildlife. To safeguard the sensitive , access is regulated to limit visitor impact, with schedules and harbor capacity ensuring controlled numbers. The main facilities and select paths are designed for , including wheelchair-friendly routes around the harbor and .

Events and Activities

Marker Wadden offers a range of organized events and activities centered on observation, education, and recreation, emphasizing the archipelago's role in restoration. opportunities are available during the spring migration season from March to May, allowing visitors to observe species such as common terns and barnacle geese in their natural habitats along designated trails and observation huts. Summer programs include excursions and opportunities around the islands, promoting sustainable water-based in the improved environment. Educational initiatives and eco-tours, often in collaboration with Nationaal Park Nieuw Land, educate participants on restoration and . Key milestones include the opening of the first to the on , which drew nearly 3,000 visitors over the inaugural weekend to experience the new trails and birdlife. In 2023, the harbor achieved full access, expanding opportunities for tours and activities across the .

Future Plans and Monitoring

Expansion Phases

The expansion of Marker Wadden beyond the initial 1,300 hectares is outlined in the Marker Wadden Plus initiative, announced in June 2024 by Natuurmonumenten and the Markerzand consortium, which aims to add approximately 1,000 hectares of new nature areas over a long-term period through combined sand extraction and ecological development. This phase emphasizes strengthening existing coastlines and creating additional shallow waters and islands to enhance , with a focus on by designing adaptive landscapes that mitigate and improve water dynamics in the . The long-term vision targets a total restored area of up to 100 square kilometers, integrating the as a key component of Nationaal Park Nieuw Land. The initiative includes plans for ecological connectivity by linking Marker Wadden to the adjacent and Lepelaarplassen to form a continuous corridor with the open waters of the , aiming to connect 3,000 hectares of marshland. This expansion incorporates climate-adaptive measures such as elevated terrains and dynamic sediment management to counter rising water levels and erosion, while exploring opportunities for new land through sustainable practices. Funding strategies include potential support from the and private partnerships with firms like and , though initial phases may proceed without full national government allocation pending the Programma Aanpak Grote Wateren. In 2025, feasibility studies advanced through the publication of the Notitie Reikwijdte en Detailniveau (NRD) on February 12, confirming the viability of expansion sites in the north, east, and south of the current archipelago via that balances sand yields with habitat creation. on the NRD ran from February 12 to March 25, 2025, gathering stakeholder input to refine alternatives ahead of the full (milieu-effectrapportage); as of November 2025, outcomes of the consultation are incorporated into ongoing preparations for the MER, with continuing. These updates underscore the project's commitment to scalable, resilient growth without immediate reliance on additional recreational .

Ongoing Research and Monitoring

Since the construction of the Marker Wadden islands between 2016 and 2018, a comprehensive monitoring framework has been implemented to track ecological and hydrological developments, coordinated primarily by Deltares and Marine Research. Annual surveys, initiated in 2017 as part of the Knowledge and Innovation Programme Marker Wadden (KIMA 1.0), employ a range of methods including bathymetric surveys, sampling via cores, measurements of currents and waves, and biodiversity transects along shorelines to assess and populations. These efforts continued into KIMA 2.0 (2023-2026), with intensified field campaigns in 2024 and 2025 focusing on long-term sedimentation rates and mud capture dynamics to inform strategies. Key findings from these monitoring activities highlight substantial ecological gains. A 2022 synthesis from the first five years of research documented a significant increase in , including a rise in breeding bird from 43 in 2020 to 47 in 2021, alongside over 60,000 migratory birds utilizing the area annually, demonstrating the islands' role as enhanced and a stepping stone for waterfowl. More recent assessments, including 2023 surveys, identified 21 across the , with four new arrivals such as pike and signaling successful reedbed establishment and improved spawning conditions in nutrient-rich zones. In response to observed and rates of a few centimeters per year, adaptive measures have been applied, such as proposals for slow and targeted sediment nourishment in vulnerable areas to maintain island integrity. Research collaborations extend beyond national partners, integrating international perspectives on for lake restoration. Deltares leads joint efforts with Marine Research, , Natuurmonumenten, , and academic institutions like Aeres University and the , producing outputs such as doctoral theses, scientific articles, and policy evaluations. Data from these studies are shared through open-access platforms maintained by , facilitating global knowledge exchange on sediment-driven ecosystem recovery and supporting broader applications in coastal and inland water management.

References

  1. https://www.natuurmonumenten.nl/projecten/marker-wadden/english-version
  2. https://www.rijkswaterstaat.nl/en/projects/iconic-structures/marker-wadden
  3. https://www.ecoshape.org/en/cases/marker-wadden/
  4. https://nlplatform.com/articles/marker-wadden
  5. https://cms.deltares.nl/assets/common/downloads/Summary-KIMA-rapport_11okt22-1.pdf
  6. https://www.nck-web.org/boa-2024/848-kima2-0
  7. https://www.deltares.nl/en/news/marker-wadden-and-the-financial-barriers-to-nature-restoration
  8. https://www.natuurmonumenten.nl/projecten/marker-wadden/english-version/the-present-situation
  9. https://link.springer.com/article/10.1007/s10236-010-0322-2
  10. https://www.researchgate.net/figure/a-Lake-Markermeer-and-Lake-IJsselmeer-the-former-Zuiderzee-estuary-in-central_fig1_241038478
  11. https://www.commissiemer.nl/projectdocumenten/00000514.pdf
  12. https://ibed.uva.nl/content/news/2018/10/markermeer.html
  13. https://www.sciencedirect.com/science/article/pii/S0048969723053937
  14. https://waterinfo-extra.rws.nl/publish/pages/187929/policy-evaluation-marker-wadden-eng-def.pdf
  15. https://magazine.boskalis.com/issue04/marvelous-marker-wadden
  16. https://boskalis.com/media/kvroa24r/boskalis_sustainability_report_2020.pdf
  17. https://www.iadc-dredging.com/wp-content/uploads/2019/05/terra-et-aqua-154-4.pdf
  18. https://www.ecoshape.org/en/the-building-with-nature-philosophy/building-with-nature-principles/
  19. https://www.uu.nl/sites/default/files/rebo-ucwosl_assessment_marker_wadden_finalpaper.pdf
  20. https://boskalis.com/sustainability/environmental-and-social/nature-based-solutions/beneficial-use-of-sediment
  21. https://www.vanoord.com/en/updates/rijkswaterstaat-awarded-van-oord-contract-dredge-marker-wadden-channel/
  22. https://boskalis.com/sustainability/cases/marker-wadden
  23. https://www.arcadis.com/en-us/projects/europe/netherlands/the-marker-wadden-islands
  24. https://www.sciencedirect.com/science/article/pii/S0925857422000295
  25. https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2023.952845/full
  26. https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2664.70021
  27. https://www.ecoshape.org/en/flora-and-fauna-flourish-on-marker-wadden/
  28. https://h2o-watermatters.com/includes/partials/printArticle.php?ed=202306&art=01_Artikel
  29. https://www.researchgate.net/publication/380502858_Human-Made_1000_Hectare_Archipelago_Marker_Wadden_Has_Positive_Impact_on_Regional_and_Flyway_Populations_of_Waterbirds_of_Dynamic_Freshwater_Ecosystems
  30. https://www.resource-online.nl/index.php/2024/01/30/fish-like-marker-wadden/?lang=en
  31. https://onlinelibrary.wiley.com/doi/full/10.1002/aqc.4052
  32. https://rewildingeurope.com/rew-project/marker-wadden-restoration-project/
  33. https://www.nationaalparknieuwland.nl/en/about-us/researches-2023/flying-colonists-insects-on-marker-wadden
  34. https://waterinfo-extra.rws.nl/publish/pages/187929/summary-kima-rapport_11okt22.pdf
  35. https://www.sciencedirect.com/science/article/pii/S0043135423003512
  36. https://pure.knaw.nl/portal/files/897720982/Jin_et_al_2023.pdf
  37. https://www.deltares.nl/en/expertise/projects/marker-wadden
  38. https://www.ecoshape.org/app/uploads/sites/2/2020/06/Factsheet-Marker-Wadden_BCteam_2021.pdf
  39. https://www.bloomberg.com/news/articles/2016-08-02/the-netherlands-is-cleaning-up-markermeer-lake-by-constructing-the-marker-wadden-artificial-islands
  40. https://www.sciencedirect.com/science/article/pii/S092585742500196X
  41. https://conferences.iaia.org/2015/Final-Papers/Markerwadden%20poster%20100x200-LowRes_15042015-final.pdf
  42. https://pmc.ncbi.nlm.nih.gov/articles/PMC10373381/
  43. https://link.springer.com/article/10.1007/s13280-025-02266-x
  44. https://research-portal.uu.nl/files/185021827/s11273-023-09936-1.pdf
  45. https://www.arcadis.com/en/insights/blog/global/piet-dircke/2022/are-nature-based-solutions-the-answer-to-the-climate-emergency
  46. https://waterinfo-extra.rws.nl/projecten/lijst-projecten/kennis-marker-wadden/kennis-innovatieprogramma-marker-wadden/nieuwsarchief/nieuwsarchief/2022/sediment-highly-underestimated-building-block/
  47. https://www.trouw.nl/nieuws/vissers-zijn-niet-welkom-op-de-marker-wadden-en-moeten-ophoepelen~b2a8492f/
  48. https://www.volkskrant.nl/columns-opinie/we-geven-te-veel-landbouwgrond-onnodig-terug-aan-de-natuur~b0f31833/
  49. https://stateninformatie.flevoland.nl/documenten/ingekomen-stukken/DOCUVITP-1730883-v1-Rapportage-en-gespreksverslagen-informatie-2015-dd-08-04-2015-1.PDF
  50. https://zoek.officielebekendmakingen.nl/kst-31089-120.pdf
  51. https://www.nature.com/immersive/d41586-023-01370-w/index.html
  52. https://www.bootmarkerwadden.nl/english/
  53. https://www.nationaalparknieuwland.nl/en/overview-of-locations/4254068720/marker-wadden-harbour
  54. https://www.nationaalparknieuwland.nl/en/overview-of-locations/3651332530/island-pavilion-marker-wadden
  55. https://nationaleparken.nl/en/parks/nationaal-park-nieuw-land/op-marker-wadden-expeditie
  56. https://www.we12travel.com/marker-wadden-nieuw-land-national-park/
  57. https://birdingplaces.eu/en/birdingplaces/netherlands/marker-wadden
  58. https://www.nationaalparknieuwland.nl/en/the-park/marker-wadden
  59. http://www.nakedkayaker.com/blog/netherlands-markermeer-marker-wadden
  60. https://nationaleparken.nl/en/the-parks/national-park-new-land
  61. https://rewildingeurope.com/news/marker-wadden-project-reaches-milestone-with-island-opening/
  62. https://www.natuurmonumenten.nl/natuurgebieden/marker-wadden/nieuws/marker-wadden-plus-toekomstbestendig-maken-natuureilanden-en
  63. https://zeepost.info/natuurmonumenten-zint-op-uitbreiding-marker-wadden/
  64. https://www.natuurmonumenten.nl/nieuws/onderzoek-marker-wadden-plus-een-stap-verder-publicatie-notitie-reikwijdte-en-detailniveau
  65. https://life-ip-deltanatuur.nl/cms/view/6c367e5b-65ba-4487-9a7a-86c59dc4a136/verbinding-markermeer-lepelaarplassen-oostvaardersplassen
  66. https://www.smartland.nl/single-post/design-research-marker-wadden-plus
  67. https://www.wur.nl/en/show-longread/a-day-counting-fish-on-the-marker-mudflats.htm
  68. https://waterinfo-extra.rws.nl/projecten/lijst-projecten/kennis-marker-wadden/kennis-innovatieprogramma-marker-wadden/final-results/
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