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Hecate Strait
Hecate Strait
Hecate Strait
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Hecate Strait (/ˈhɛkɪt/; Haida language: K̲andaliig̲wii,[1] also siigaay which means simply "ocean") is a wide but shallow strait between Haida Gwaii and the mainland of British Columbia, Canada. It merges with Queen Charlotte Sound to the south and Dixon Entrance to the north. About 140 kilometres (87 mi) wide at its southern end, Hecate Strait narrows in the north to about 48 kilometres (30 mi).[2] It is about 260 kilometres (160 mi) in length.[3]

Key Information

Definition

[edit]

According to the BCGNIS, the southern boundary of Hecate Strait is defined as a line running from the southernmost point of Price Island to Cape St James on Kunghit Island, the southernmost point of Haida Gwaii. The northern boundary is a line from Rose Point, the northeastern tip of Graham Island, to Hooper Point at the north end of Stephens Island off the mainland.[2]

History

[edit]

The Haida of Haida Gwaii crossed the Hecate Strait to the mainland to plunder coastal villages to take slaves and booty. Sometimes mainland First Nations crossed Hecate Strait to Haida Gwaii, such as a Nisga'a war party from the lower Nass River, which crossed the strait in a retaliatory raid after an attack by Haida Ravens from Hiellen, which took Nisga'a slaves back to Hiellen. The inhabitants of Hiellen, fearing a Nisga'a retaliation, took refuge in Masset. The Nisga'a found Hiellen abandoned and burned it to the ground. Haida from Masset counterattacked, resulting in a long battle at Hiellen and nearby Taaw Tldáaw. The Nisga'a survivors crossed Hecate Strait again to return home.[4]

The Strait was first explored for the Europeans in 1792 by the Spanish Armada explorer Jacinto Caamaño. Hecate Strait was named by Captain George Henry Richards in 1861 or 1862 after his surveying vessel, HMS Hecate.[2]

Geology

[edit]

During the last ice age, the seafloor in this area was a wide coastal plain stretching south to the Olympic Peninsula and including what is now Queen Charlotte Sound.[5] The depth of the strait varies from 200 metres in the south to 25 metres east of Rose Spit.[6]

Flora and fauna

[edit]

The strait once contained strong salmon and halibut fisheries.

Hecate Strait is one of the few locations in the world with species from the glass sponge class of fauna. Regions with these sponge are currently protected from damage by commercial fishing.[7]

The Hecate Strait and Queen Charlotte Sound Glass Sponge Reefs Marine Protected Area was designated by the Fisheries and Oceans Canada in February 2017. The MPA is located in the Northern Shelf bioregion of the Pacific Region, southeast of Haida Gwaii, North and South of the entrance to the Douglas Channel. The MPA is composed of three individual areas known as the Northern Reef, the Central Reefs, and the Southern Reef. Together these three areas cover approximately 2,410 square kilometers.[8] The four reef complexes in the Hecate Strait and Queen Charlotte Sound discontinuously cover an area of about 1,000 km2, and are located in glacial troughs between 140 m and 240 m deep.

Hazards and restrictions

[edit]

Environment Canada comments that “it has been said that the Hecate Strait is the fourth most dangerous body of water in the world”.[9] It is noted for strong winds, seasonal fog, powerful tidal currents, frequent southeast gales and shallow waters. During winter storms, swells commonly reach 8 to 10 metres in the southern part of the Strait.[9] The northern Strait is more protected, experiencing swells near 8 metres only once or twice a winter.[9] Shallow water depths over large sections of Hecate Strait allow short steep periods waves to develop quickly.[9] This makes transiting across the Strait quite dangerous for smaller vessels.[9]

A local author goes further, commenting that swells can reach 10 to 20 meters and expose the sea floor.[10]

There is a moratorium on large oil tankers in a large zone that includes the Hecate Strait.[11]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Hecate Strait

View on Grokipedia
from Grokipedia
Hecate Strait is a wide but relatively shallow strait in the eastern North , situated off the central coast of , Canada, and separating the archipelago from the mainland. It stretches approximately 220 km in a north-south direction from in the north to the northern entrance of Queen Charlotte Sound in the south, serving as a key marine passage in the region. The strait varies in width from about 60 km at its northern end to 130 km in the south, and features shallow depths overall, with a broad northern basin less than 50 m deep and deeper channels reaching up to 240 m in some areas. Named in 1861 after the British paddle-wheel sloop HMS Hecate, which conducted detailed surveys of the area between 1860 and 1862, the strait is renowned for its challenging navigational conditions due to frequent strong winds, treacherous tidal currents, and rapid weather changes that can generate hazardous seas. Geologically, it lies over a glaciated , with features shaped by past ice ages, including submarine channels and banks that influence water flow and sediment distribution. Ecologically, Hecate Strait supports rich marine , including significant populations of fish species targeted by commercial fisheries such as and , as well as migratory gray whales that use it as a feeding corridor. A standout feature is the Hecate Strait and Queen Charlotte Sound Glass Sponge Reefs , established in 2017 to safeguard ancient sponge reefs—unique ecosystems covering about 1,000 km² at depths of 140–240 m, representing the largest known living glass sponge reefs and providing critical for deep-sea organisms. The area also plays a vital role in regional shipping lanes and Indigenous cultural practices, particularly for the Haida Nation, whose traditional territories encompass its waters.

Geography

Location and boundaries

Hecate Strait is a wide but shallow located in the northeastern , separating the of —formerly known as the Queen Charlotte Islands—from the mainland coast of , . It forms a critical segment of the coastal waterway system, connecting more open oceanic waters to sheltered inner passages used for navigation along the . The strait lies within the Northern Shelf Bioregion and is characterized by its exposure to prevailing winds and tidal influences from the adjacent . The northern boundary of Hecate Strait is defined by , a broader passage linking it to the open ocean north of , while the southern boundary occurs where it merges with Queen Charlotte Sound, transitioning into more complex island-studded waters. To the west, the boundary follows the eastern coastline of , encompassing the shores of and Moresby Island, whereas the eastern boundary traces the irregular mainland coast, including fjords, inlets, and islands such as those near Prince Rupert and extending southward toward Aristazabal Island. These boundaries enclose a dynamic marine corridor essential for regional maritime traffic. Hecate Strait measures approximately 260 kilometres (160 miles) in length along its north-south axis. Its width varies significantly, reaching up to 140 kilometres (87 miles) at the southern end near Queen Charlotte Sound and narrowing to about 48 kilometres (30 miles) toward the northern end adjacent to . The strait is centered at roughly and .

Physical characteristics

Hecate Strait features a relatively shallow , with water depths generally ranging from 20 to 220 meters across much of its expanse, though deeper channels in the southwestern Moresby Trough can reach up to 475 meters. This shallow profile, compared to the deeper surrounding basins, promotes significant vertical mixing and influences local circulation patterns. The strait lies between to the west and the mainland to the east, with its bathymetric variations including extensive banks like Dogfish Bank, where depths are often less than 20 meters. The strait experiences strong tidal currents, driven by predominantly semi-diurnal with ranges varying from about 3 meters at the southern entrance to over 5 meters midway and up to 6 meters during spring in northern sections. These currents can attain speeds of up to 0.5 meters per second, particularly over shallower banks, enhancing mixing and resuspension. Prevailing winds, often from the northwest in summer and shifting to southeasterly in winter, further amplify this mixing by generating surface currents and waves that propagate across the strait's length. Surface salinity in Hecate Strait typically measures 31 to 33 practical salinity units (psu), with minimal seasonal variation in offshore areas but reductions near coastal inputs due to freshwater runoff. temperatures exhibit pronounced seasonal fluctuations, ranging from approximately 5°C in winter to 15°C in summer at the surface, while deeper waters remain cooler at 6 to 8°C year-round. events, particularly during summer under northerly winds, introduce nutrient-rich, colder waters from the adjacent shelf, fostering enhanced primary productivity across the strait. Water exchange in Hecate Strait is significantly influenced by adjacent fjords and sounds, such as those in the system and Caamaño Sound, which facilitate estuarine circulation with surface outflows of fresher water and compensatory deep inflows from the strait. This dynamic promotes periodic renewal of deeper waters, though sills in connecting channels can restrict full mixing and lead to localized variations in oxygen and nutrient profiles.

History

European exploration and naming

European exploration of the Hecate Strait region began in the late 18th century, primarily through Spanish voyages aimed at asserting territorial claims along the coast. In 1792, Spanish explorer Jacinto Caamaño, commanding the corvette Sutil, became the first European to navigate into the waters of what is now during his expedition to survey the northern coast and search for a . British expeditions, such as those led by in 1778 and in 1791–1795, focused more on the southern and central coasts, with only distant sightings or vague references to the northern strait area without detailed mapping or naming. The formal naming and initial systematic mapping of Hecate Strait occurred during the mid-19th-century British hydrographic surveys of the coast. In 1860, Captain George Henry Richards of the Royal Navy was appointed to command HMS Plumper for surveying and adjacent mainland coasts, continuing work initiated in previous years. By late 1860, the paddle sloop HMS Hecate replaced the Plumper, enabling more extensive northern surveys, including the strait separating from the mainland. Richards named Hecate Strait in 1861 after his survey vessel HMS , recognizing its role in charting the challenging waters as a navigable passage amid the broader exploration efforts. This naming was part of Richards' comprehensive hydrographic work from 1860 to 1862, which produced detailed charts essential for maritime navigation and colonial development in the region.

Indigenous and early human presence

Hecate Strait forms part of the traditional territories of the , whose ancestral lands encompass to the west, and various groups, including the Metlakatla, Lax Kw'alaams, Kitsumkalum, and Kitselas, along with the inland and peoples on the mainland coast to the east. These Indigenous nations have maintained connections to the strait for millennia, with the Haida utilizing its for maritime activities and the groups asserting rights over eastern coastal areas such as Prince Rupert Harbour and Lelu Island since . The and territories extend from river valleys like the Skeena and Nass to coastal trade networks linking to Hecate Strait. For thousands of years, Strait served as a vital migration route, ground, and corridor for these peoples, facilitating seasonal movements and exchanges across the region. Archaeological evidence, including shell middens in the Dundas Archipelago—part of territory—demonstrates continuous occupation from the early , with sites dated as early as 9690 years containing shellfish remains indicative of sustained coastal resource use. In the Prince Rupert area adjacent to the strait, over 100 shell midden sites associated with villages reveal year-round habitation, particularly during winter and spring for salmon and , with middens accumulating artifacts and food remains over centuries. networks, such as grease trails, connected inland and communities to Strait, where grease was harvested and exchanged with coastal groups, including the Haida across the strait. The strait features prominently in Haida and Tsimshian oral histories and mythology, embodying stories of creation, migration, and resource stewardship that underscore its cultural significance. Haida narratives describe ancient voyages across Hecate Strait as pathways for ancestral travels and interactions with the marine world, while Tsimshian oral traditions affirm territorial claims through genealogies tied to coastal sites around the strait. Seasonal gatherings focused on salmon runs and eulachon spawning in the strait's waters and adjacent rivers supported communal harvesting practices that reflected intergenerational knowledge of ecological cycles. These traditions highlight pre-contact stewardship, where Indigenous practices ensured sustainable use of the strait's resources through customary laws and seasonal rotations. During the late , initial interactions with European fur traders introduced new dynamics to Indigenous stewardship of Hecate Strait, as Haida and peoples engaged in early exchanges of marine resources like pelts while continuing traditional practices. Prior to the 1850s, these contacts were sporadic and centered on coastal trading posts, allowing Indigenous groups to maintain control over the strait's use as a corridor for and inter-nation .

Geology

Geological formation

Hecate Strait's geological formation is primarily the result of intense glacial erosion during the Pleistocene epoch, spanning the last 2.5 million years, when the advanced across the region multiple times. Glaciers originating from the to the east and the Queen Charlotte Mountains (now ) to the west carved a broad, shallow basin through repeated scouring, eroding pre-existing sediments and bedrock to create the strait's characteristic U-shaped troughs and depressions. The most significant modifications occurred during the Late Wisconsinan glaciation (approximately 25,000 to 11,000 years ago), when thick ice deepened the central channel and smoothed surrounding highs. The strait's tectonic framework is dominated by the Queen Charlotte Fault system, a major marking the boundary between the Pacific and North American plates, which has influenced regional deformation since at least the Late era. This fault zone, extending over 1,000 kilometers offshore , exhibits predominantly strike-slip motion with components of oblique convergence, generating significant seismic activity and controlling the alignment of basins like Hecate Strait. The fault's basement-controlled structure, involving fault-bounded blocks, has facilitated differential uplift and , shaping the strait's elongated form between the mainland and while contributing to ongoing tectonic instability. Following around 15,000 to 11,000 years ago, post-glacial isostatic played a key role in the strait's current morphology, as the removal of the ice load allowed the crust to uplift at rates initially exceeding 10 mm per year in peripheral areas. This elevated the , reducing overall depths to an average of 80-100 and exposing or shallowing marginal areas, while eustatic sea-level rise partially counteracted the effect in the central basin. The process continues today at slower rates, influencing sediment stability and coastal evolution. The underlying of consists mainly of sedimentary and volcanic rocks, formed during the to periods as part of the broader Queen Charlotte Basin terrane assemblage. These include interbedded sandstones, shales, and volcanic flows from the and Wrangellia terranes, which were accreted to the North American margin and later intruded by plutons. Exposed in surrounding uplands and inferred beneath glacial cover, this foundation provided the resistant substrate that glaciers eroded to form the strait, with Tertiary sediments overlying it in the basin's deeper sections.

Surficial features and seabed

The seabed of Hecate Strait is characterized by four primary surficial geological units identified through geophysical surveys, including seismic profiling and : Tertiary bedrock outcrops, glacial till deposits, Quaternary sands and gravels, and thick marine silts and muds. These units reflect a mosaic of post-glacial sedimentation patterns, with glacial till forming a widespread substrate that has been partially reworked by subsequent marine processes. Rocky outcrops of Tertiary bedrock are prominent in shallower, elevated areas, while glacial till dominates mid-depth terrains, often appearing as acoustically opaque layers up to several meters thick. In the central regions of the strait, where depths exceed 200 meters, soft sediments predominate, consisting primarily of fine-grained silts and clays that accumulate in low-energy depositional environments. These muds form thick blankets, exceeding 10 meters in places, and are derived from suspended sediment inputs during and ongoing fluvial discharge. Near the shores and in shallower zones above 100 meters, coarser materials prevail, including gravelly lags and pebbly sands that represent winnowed remnants of glacial deposits or lag surfaces exposed by . mapping efforts, including multibeam and data from surveys conducted around 2017 in association with designations, have revealed preserved glacial landforms from the , such as streamlined bedforms and moraine-like ridges, alongside widespread iceberg scours—linear furrows up to 7 meters deep and several kilometers long, formed by calved icebergs grounding on the seafloor during retreat. Tidal and storm-driven currents, which can exceed 0.8 m/s in the , significantly influence distribution by eroding fine materials from highs and transporting them to adjacent basins, thereby maintaining a dynamic equilibrium in surficial features. These hydrodynamic forces generate mobile bedforms, including sand waves, dunes up to 10 high, and smaller ripples with wavelengths of 1–5 , particularly on banks like Dogfish Bank where northward migration rates reach 15 per year under combined tidal and wind influences. Such bedforms, composed of medium to coarse sands, highlight ongoing redistribution, with gravelly lags stabilizing in high-shear areas resistant to . These contemporary features overlay the glacial legacy of the , shaped by Pleistocene advance and retreat.

Ecology

Marine habitats and biodiversity

Hecate Strait encompasses diverse pelagic and benthic marine habitats, where nutrient-rich drives and supports complex food webs. The strait experiences weak but persistent summer that delivers deep-water nutrients to the surface, fostering seasonal blooms primarily composed of diatoms such as Skeletonema costatum. These blooms form the foundational layer of the , channeling energy through and higher trophic levels to sustain , , and top predators. In the , juvenile Pacific salmon (* spp., including sockeye, , chum, coho, and chinook) utilize the strait as a critical migration and rearing area, with abundance indices showing mixed trends post-2003, including declines in many stocks since 2017 due to environmental stressors. Benthic habitats, influenced by variable bottom types and depths, host commercially important groundfish assemblages, including Pacific halibut (Hippoglossus stenolepis)—whose biomass has continued to decline since the 2010s, with a shift toward younger mean ages in recent assessments—and (Gadus macrocephalus), which reached historic lows in the early 2000s, showed temporary recovery peaking around 2014, followed by declines, with recent survey indices indicating stability as of 2023. Synoptic bottom trawl surveys have documented 47 species in these assemblages, underscoring the strait's role in supporting diverse communities. thrive here as well, with (Metacarcinus magister) maintaining stable, abundant populations since the 1990s and forming a key component of the benthic . Marine mammals frequent Hecate Strait for feeding and seasonal migration, drawn by the productive waters. Harbor seals (Phoca vitulina) have stabilized after recovering from 1970s protections, while Steller sea lions (Eumetopias jubatus)—listed as special concern—are rebounding and use haul-out sites along the shores for resting between foraging dives on fish and squid. Northern resident orcas (Orcinus orca) rely on the strait for predation, with their population growing from the 1970s to approximately 330–340 individuals as of 2025. Humpback whales (Megaptera novaeangliae), designated as of special concern, migrate through the area and feed on and small schooling fish during summer months. Seabirds nest on adjacent islands and islands but forage extensively in the strait, exploiting its rich prey resources. Ancient murrelets (Synthliboramphus antiquus), listed as special concern, breed colonially nearby and conduct foraging trips spanning large portions of Hecate Strait to capture and small fish like larval . Marbled murrelets (Brachyramphus marmoratus), threatened due to loss, also forage in the strait for euphausiids, mysids, and juvenile fish while nesting in old-growth forests on surrounding land. Large numbers of these and other alcids, including Cassin's auklets, concentrate over the shelf break during breeding seasons to feed on upwelled nutrients. Tidal mixing in the shallow, enclosed waters of Hecate Strait creates biodiversity hotspots by enhancing nutrient exchange and habitat heterogeneity, promoting elevated species richness across trophic levels. Glass sponge reefs contribute to these hotspots by providing structural complexity that supports additional epifaunal communities.

Glass sponge reefs

The Hecate Strait hosts four major glass sponge reefs, known as the Northern Reef, two Central Reefs, and the Southern Reef, collectively spanning approximately 1,000 km² at depths of 140 to 240 meters between and the mainland. These structures are composed primarily of sponges, including species such as Aphrocallistes vastus, Heterochone calyx, and Farrea occa, which build fused silica skeletons forming reef mounds up to 25 meters high. The reefs are estimated to be over 9,000 years old, representing the largest known living examples of such formations. These glass sponges are slow-growing, at rates of approximately 1 cm per year, and function as that process vast volumes of seawater to capture and , thereby playing a key role in nutrient cycling. Their three-dimensional structures create complex habitats that serve as nurseries and refuges for diverse , including juvenile , , spot prawns, and other finfish, supporting ten times more juvenile than surrounding seafloor areas. The sponges' silica-based spicules remain intact after death, allowing dead colonies to accumulate and form the persistent framework. As living fossils, these reefs provide paleontological insights into ancient ecosystems, resembling formations from the and periods that were last widespread around 150 million years ago. However, they face significant threats from human activities, particularly , which can destroy centuries of growth in a single pass due to the sponges' fragility and low reproduction rates. Increased from nearby disturbances can also smother the sponges, inhibiting their filtration processes. In recognition of their outstanding universal value, the reefs were proposed for World Heritage status in 2018. As of 2023, a management plan is under development in collaboration with Indigenous partners, with ongoing annual monitoring.

Human Use and Conservation

Economic activities

Hecate Strait serves as a major fishing ground for commercial harvests of , , , and groundfish, supporting a range of directed fisheries managed by (DFO). fisheries, primarily targeting sockeye, , chum, and coho through gillnet and troll methods, historically contributed an average of 21% to British Columbia's total landings between 1951 and 1979, with annual catches ranging from 1.8 million to 10.8 million across adjacent areas including Hecate Strait. and are harvested via longline in areas such as 5A-5E, with coast-wide directed commercial halibut landings reaching approximately 11,100 tonnes in 2021. Groundfish fisheries, encompassing species like , rock sole, and English sole, saw historical peaks in the mid- to late ; for instance, landings exceeded 8,000 tonnes in 1987, while rock sole harvests surpassed 3,000 tonnes in the early 1990s, and English sole fluctuated up to 2,600 tonnes annually from the 1940s to 1990s, contributing to pre-2000s totals often over 10,000 tonnes combined for the strait. Shipping and navigation through Hecate Strait form a vital corridor for coastal trade, connecting to northern ports like Prince Rupert and facilitating the transport of goods, including logs via tugs and scows from . Although a federal moratorium since 1972 limits large oil tankers carrying over 12,500 metric tonnes of crude or persistent oils from loading or unloading in the region, smaller tankers occasionally transit the strait as part of northern supply routes, subject to strict environmental regulations. Navigation challenges arise from strong tidal streams, reaching up to 8 knots in adjacent narrows like Hawkins Narrows and erratic currents influenced by the strait's shallow depths and winds, necessitating compulsory pilotage in areas under the Pacific Pilotage Authority, such as coastal waters. Other economic uses include limited aquaculture development and emerging tourism activities. Aquaculture potential remains constrained by the strait's strong currents and variable conditions, with few active sites despite identified opportunities for species like and in adjacent ecozones; most finfish farming occurs elsewhere on the coast. Tourism focuses on eco-tours and , leveraging the strait's rich , including humpback and sightings, with guided sailing and viewing excursions departing from ports like Sandspit on . These activities contribute to British Columbia's seafood industry, valued at $1.6 billion in commercial landed value in 2023, with Hecate Strait fisheries playing a key role through groundfish, , and harvests that support processing and export. Indigenous commercial fishing rights are integral, with First Nations holding communal allocations such as 22% of and 14% of sablefish quotas in 2021, bolstered by federal investments exceeding $11 million for expanded access and training opportunities.

Protected status and management

In 2017, (DFO) designated the Hecate Strait/Queen Charlotte Sound Glass Sponge Reefs as a (MPA) under the Oceans Act, encompassing approximately 2,410 km² of ocean southeast of . The MPA includes core protection zones where bottom-contact fishing gear, such as , is prohibited to prevent damage to the fragile glass sponge reefs, alongside zones that allow limited activities like mid-water fishing under strict conditions to minimize sediment disturbance. These measures aim to conserve the biological diversity, structural , and functions of the reefs, which are recognized as globally unique and slow-growing ecosystems requiring centuries for recovery. Management of the MPA is collaborative, involving DFO as the lead federal authority, the Haida Nation, the Province of , and other stakeholders, with a focus on cooperative approaches outlined in a developing management plan. This framework aligns with broader reconciliation efforts, including the 2018 Reconciliation Framework Agreement for Bioregional Oceans Management and Protection in the Northern Shelf Bioregion, which promotes Indigenous co-management to integrate and support cultural and ecological stewardship. Enforcement relies on the Oceans Act and Fisheries Act, with surveillance monitoring compliance through vessel tracking and patrols. Ongoing monitoring and research assess reef health, , and emerging threats like climate change impacts on and sponge growth, forming part of Canada's national MPA network under the Oceans Act. Since 2017, DFO has deployed multiple oceanographic moorings to track currents, water properties, and , while studies evaluate conservation effectiveness using vessel tracking data. Key challenges include balancing protections with ongoing shipping traffic—permitted for but regulated against anchoring in core zones—and residual fishing pressures in adjacent areas, prompting continued adaptive strategies to mitigate human impacts.

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  56. https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/agriculture-and-seafood/statistics/industry-and-sector-profiles/sector-snapshots/af_sector_snapshots_seafoodfisheries_2023.pdf
  57. https://waves-vagues.dfo-mpo.gc.ca/library-bibliotheque/41098067.pdf
  58. https://www.canada.ca/en/fisheries-oceans/news/2022/02/government-of-canada-invests-118-million-in-indigenous-fisheries-opportunities-in-bc.html
  59. https://www.canada.ca/en/fisheries-oceans/news/2017/02/hecate_strait_andqueencharlottesoundglassspongereefsmarineprotec.html
  60. https://www.dfo-mpo.gc.ca/oceans/mpa-zpm/index-eng.html
  61. https://laws-lois.justice.gc.ca/eng/regulations/SOR-2017-15/index.html
  62. https://mpanetwork.ca/wp-content/uploads/2022/11/MPA_Network-Action-Plan_web.pdf
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