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Llyn y Fan Fach
Llyn y Fan Fach
Llyn y Fan Fach
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Llyn y Fan Fach (Welsh meaning "little lake of the peak")[1] is a lake of approximately 10 hectares (25 acres) on the northern margin of the Black Mountain in Carmarthenshire, South Wales and lying within the Brecon Beacons National Park. The lake lies at an altitude of approximately 1,660 feet (510 m), immediately to the north of the ridge of the Carmarthen Fans. It is the smaller of two lakes within this mountain massif: the slightly larger Llyn y Fan Fawr is about 2 miles (3.2 km) to the east.

Key Information

Geology

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The lake is overlooked by several prominent mountain peaks, especially Picws Du and Waun Lefrith. Waun Lefrith is formed from the sandstones and mudstones of the Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. Its southern slopes are formed from the hard-wearing sandstones of the overlying Plateau Beds Formation which are of upper/late Devonian age. It is those rocks which form vertical crags along the top edge of the scarp. The northern face of Waun Lefrith was home to a glacier during the ice ages which gouged out the cwm in which Llyn y Fan Fach now sits. This empties via the Afon Sawdde into the River Towy. The southern slopes drain via the Twrch Fechan, the Nant Menyn and Nant Lluestau into the Afon Twrch and so into the River Tawe.[2] Large moraines occur to the east of the summit at the base of the scarp, and below the prominent peak of Picws Du as well as those damming the Lake.

Legend of Llyn y Fan Fach

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The lake with Picws Du in the foreground

A folklore legend is connected with the lake, known as the Lady of the Lake. In the folk tale,[3] a local young man, son of a widow from Blaen Sawdde (near Llanddeusant) agreed to marry a beautiful girl who arose from the lake, with the condition that he would not hit her three times. He complied easily because the girl was so beautiful, and they were happy for years putting up a house in Esgair Llaethdy near Myddfai, and bringing up a family there. The girl had very special cattle, traditionally still kept at Dinefwr, Llandeilo,[4] and other animals. But over time the man did hit his wife three times. Reasons for why he hit her vary, from the wife laughing at a funeral or crying at a wedding. Regardless, she had to go back to the lake according to the promise, taking the cattle with her. Among the cattle was a team of four oxen which were ploughing at the time. They followed too, plough and all, and, “they say, to this very day you may see a well-marked furrow running right across Myddfai mountain to the edge of Llyn-y-Fan-Fach, which proves this story is true.”[5] But the mother returned sometimes to help and instruct her sons, and in particular one called Rhiwallon (in some versions Rhiwallon is the name of the young man who marries the fairy girl). In due course Rhiwallon and the other sons went to the court of Rhys Gryg of Deheubarth, where they became famous doctors[6] who are known today as the Physicians of Myddfai.[citation needed] A number of their medical formulae remain in the Welsh manuscripts.

Reservoir

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The lake was enlarged by the construction of a dam during World War I to provide an additional water supply to Llanelli, the population of which had grown by 34% between 1901 and 1911. Project approval in 1912 was followed by the start of construction two years later. Labour was initially provided by some 175 navvies but harsh working conditions resulted in their departure and replacement with over 150 conscientious objectors who lived in barracks (at the site of the modern car park) and with local families. Filter beds were built halfway down from the reservoir, a facility later used as a fish hatchery. Sand for construction purposes was sourced on the south side of the lake and rafted to the dam site. The works were completed in 1919.[7][8]

Access

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The lake can be reached on foot via the water company's road from the car park at the end of a single track road from Llanddeusant village. The track passes the hatchery about halfway up the hill. At the top of the track is a windowless rescue shelter or bothy by the wall of the dam. Normally unlocked, it contains a fireplace. A path continues to the west up the slope to the escarpment, following the edge of the cliff, reaching the summits of Waun Lefrith and then Picws Du, both of which overlook the lake. There are many deep gullies leading down from the cliff top, and numerous rock outcrops near the top. The Beacons Way follows the ridge down from the summits above the lake, and forms an alternative route onto or off the mountain to the dam road. It arrives in Llanddeusant village more directly, and gives access to the youth hostel in the village.

Wildlife

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Red kite soaring
Common raven in flight

There are numerous different species of bird in the area, and they include the red kite, common buzzard, kestrel, carrion crow, common raven and skylark to name a few of the most obvious residents. The former birds can often be found soaring on the updrafts near the cliffs as well as on thermals from the valley below. The red kite was previously restricted to this and adjoining areas in South Wales such as Mynydd Mallaen, mainly as a result of persecution by farmers and gamekeepers, but attitudes have now changed. It was thought that the bird preyed on game birds such as the red grouse, although the evidence showed that they survive mainly on carrion, like many other birds of prey. The kestrel and buzzard are widely distributed, but the raven is restricted to the higher mountains.

There is a wide distribution of mammals such as field voles, foxes and badgers as well as many songbirds. The skylark is plentiful due to the extensive rough pasture present below the main peaks which allows ground nesting of the species. Pied wagtails are common near the streams and torrents running from the hill tops.

References

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Further reading

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Llyn y Fan Fach

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Llyn y Fan Fach is a glacial lake on the northern edge of the Black Mountain in Carmarthenshire, South Wales, lying within the Brecon Beacons National Park at an elevation of about 510 meters above sea level. The lake spans a surface area of 11 hectares with a mean depth of 3.8 meters and a catchment area of 71 hectares, featuring high alkalinity and supporting a relatively shallow aquatic environment. Geologically, it occupies a cirque formed by glacial action, contributing to the dramatic upland landscape of the region. Culturally, Llyn y Fan Fach is the central setting for a medieval Welsh legend recounting the emergence of a beautiful maiden from the lake who marries a local herdsman, bestows enchanted cattle upon him, and bears sons who establish the lineage of the Physicians of Myddfai—a real family of 13th- and 14th-century healers whose medical manuscripts preserve empirical herbal remedies and surgical knowledge derived from observation rather than supernatural claims. The site attracts hikers via accessible paths from Llanddeusant, offering views of the surrounding Bannau Sir Gâr and opportunities for wild swimming amid its stark, unspoiled terrain.

Physical Characteristics

Location and Morphology

Llyn y Fan Fach is a glacial lake situated in , , on the northern margin of the Black Mountain within the National Park, near the community of Llanddeusant. The lake's approximate coordinates are 51.8819°N and 3.7421°W . The lake occupies a basin excavated by Pleistocene glaciation, with its outlet forming the headwaters of the Afon Sawdde via the Wennalt Fawr stream. It lies at an elevation of approximately 505 meters above , with a surface area of about 10 hectares and a shoreline perimeter of 1.535 kilometers. Classified as a small freshwater body, it exhibits high and is generally shallow, situated at mid-altitude in the landscape. Morphologically, the lake is bounded by a steep headwall rising to about 60 meters at angles of 45° to 50°, featuring prominent chutes and couloirs on the upper slopes. This corrie structure, enhanced by periglacial processes, contributes to its dramatic, enclosed form amid the surrounding and peaks such as Picws Du and Waun Lefrith. The lake is naturally dammed by morainic or material, though modifications exist for water management.

Geological Formation

Llyn y Fan Fach is situated within a glacial carved into , predominantly the Brownstones Formation, which forms the underlying bedrock of the surrounding Black Mountain escarpment. The cirque's headwall exhibits alternating layers of resistant sandstones and softer silty shales, creating a steep scarp approximately 60 meters high that defines the lake's dramatic morphology. The lake's basin resulted from intense glacial erosion during Pleistocene glaciations, with localized ice accumulation in like this one during the Loch Lomond Stadial (circa 12,700–11,700 years ago), when small glaciers and permanent snowfields sculpted the upland terrain. Glaciolacustrine sediments, deposited in proglacial lake environments, are preserved within the , evidencing post-glacial infilling. The lake is impounded by a natural , likely a glacial , which retains water and forms the headwaters of the Nant Wennalt Fawr stream. Contemporary geomorphic processes, including accumulation from and fluvial incision by outflow streams, continue to modify the 's features, maintaining active landscape evolution in this periglacial setting.

Historical Development

Prehistoric and Natural History

Llyn y Fan Fach is a occupying a basin carved into the of the Black Mountains during the Pleistocene , with significant modification during the Devensian glaciation spanning approximately 115,000 to 11,700 years ago. The corrie was excavated by small glaciers that accumulated on the northern face of Waun Lefrith, producing crescent-shaped moraines up to 18 meters high that impound the lake, which reaches a maximum depth of 6 meters. in the area comprises the Lower Brownstones Formation and Senni Formation, overlain by glacial deposits. Post-glacial natural processes have sustained the lake as the headwaters of the Afon Sawdde, with circumneutral waters (pH 7.0–7.36) characterized by low nutrients, high calcium, and bicarbonate levels supporting species-rich spring vegetation including Palustriella falcata, Campylium stellatum, and Philonotis calcarea. The surrounding landscape reflects periglacial features from the late Devensian period, contributing to the site's geological significance within the . Prehistoric human presence in the vicinity is indicated by cairns on Fan Foel, a summit overlooking the lake at approximately 626 meters elevation. Excavations conducted in 2006 by Cambria Archaeology at one such round uncovered human bone fragments from at least two individuals and pollen evidence of meadowsweet (), suggesting the deposition of flowers as a funerary tribute during the , roughly 2500–800 BCE. Additional monuments along nearby ridges underscore early upland use for burial practices amid a rugged, post-glacial terrain.

Modern Reservoir Construction

Llyn y Fan Fach, a natural , was enlarged into a through the construction of a between 1914 and 1919 to augment the for the growing of . The initiative stemmed from assessments in the late 19th and early 20th centuries identifying the site's suitability for providing clean upland water, leading to its development by Llanelli Rural District Council via a dedicated spanning approximately 25 miles. The dam raised the lake's water level by about 3 meters, transforming it into a functional impounding while preserving its scenic integration within the glacial cwm. relied on labor from around 100 conscientious objectors, who performed work as an alternative to during , enduring harsh conditions in remote barracks near the site. These workers completed the project in 1919, including associated infrastructure like filter beds and weirs on the Afon Sawdde below the dam. In recognition of its engineering, historical, and social significance—particularly the role of conscientious objectors—the dam and related water supply elements at Llanddeusant received Grade II listed status from in November 2022. This listing underscores the structure's contribution to early 20th-century public water infrastructure amid wartime labor constraints, though the reservoir's operational role has since diminished with modern supply advancements.

Folklore and Cultural Significance

The Legend of the Lady of the Lake

The legend of the Lady of Llyn y Fan Fach, a staple of Welsh folklore, describes a mystical union between a mortal shepherd and a supernatural woman emerging from the lake. According to traditional accounts, a young herdsman tending cattle near the lake's shores encountered a beautiful maiden, often named Nelferch, who appeared with her sisters while bathing or combing her hair. He attempted to woo her by offering bread, which she rejected twice—first when fully baked, deeming it too hard, and second when unbaked, deeming it too soft—before accepting on the third attempt with partially baked bread, symbolizing a balanced offering. She consented to on the condition that he never deliver three causeless blows, after which their union would dissolve. Her , a guardian figure from the lake's otherworldly realm, tested the shepherd's choice by having the sisters appear identical except for footwear; the shepherd correctly identified her by her distinctive sandal. As , she provided enchanted —, sheep, and —that emerged from the lake, ensuring the couple's prosperity at their in Esgair Llaethdy or similar locales below the Black Mountain. They bore three sons, but the was breached through minor, unintended actions: a playful flick with wet gloves at a , a gentle tap at a christening amid her untimely weeping, and a final tap at a for her incongruous . Upon the third blow, the Lady summoned her livestock with a call—"Hither, spotted cows, grey speckled , brindled , and fleet steers"—and vanished into the lake, taking the animals and leaving the shepherd destitute. He perished of grief, but the Lady later reappeared to instruct their sons in the healing arts at Pant y Meddygon near Myddfai, founding the lineage of the Physicians of Myddfai, renowned for their medical texts compiled in the 13th-14th centuries under patrons like the Lord Rhys. , rooted in , was first recorded in English in as an introduction to The Physicians of Myddfai, a collection of medieval Welsh remedies, though motifs of lake maidens and taboo marriages echo broader Celtic patterns.

Legacy in Welsh Tradition and Medicine

The legend of the Lady of Llyn y Fan Fach, wherein a lake-dwelling imparts knowledge to her sons before departing, forms a foundational narrative in Welsh , symbolizing the intersection of the and empirical healing. This tale, first documented in the after 1382, portrays the sons—Rhiwallon, Cadwgan, Gruffydd, and Einion—as inheriting otherworldly wisdom in plant-based remedies, which they applied to treat ailments among the local populace. The story's persistence in oral and written tradition underscores a cultural reverence for nature-derived , with the physicians' lineage invoked to elevate their status amid competing Anglo-Norman and ecclesiastical healing practices in 13th-century . Historically, the Physicians of Myddfai (Meddygon Myddfai), descending from Rhiwallon, established a hereditary line of healers active from the 13th to at least the , serving figures like Rhys Gryg, prince of , and granting them land privileges around 1240. Their corpus, compiled as Meddygon Myddfai in medieval manuscripts including the , comprises over 170 herbal recipes derived from local flora for conditions such as headaches, coughs, and wounds, emphasizing empirical observation over mystical elements. These texts, translated and published in 1861, represent one of the earliest systematic Welsh medical compilations in a Celtic language, prioritizing plant extracts like those from species for their therapeutic effects. The physicians' legacy endures in Welsh through preserved remedies that influenced subsequent herbalism, with the last documented practitioner, John Jones of Myddfai, copying texts in before the line's decline amid professionalization. While the origin likely served to legitimize their knowledge in a pre-scientific era, analysis of their recipes reveals practical, region-specific grounded in trial-and-error use of accessible botanicals, distinct from imported Galenic traditions. This body of work highlights causal links between environmental resources and health outcomes, contributing to a uniquely Welsh strand of folk that persisted into modern ethnobotanical studies.

Ecology and Environment

Flora and Fauna

Llyn y Fan Fach, situated within the Mynydd Du , features an oligotrophic lake environment with nutrient-poor waters and stony substrates supporting specialized aquatic flora. Characteristic plants include the locally rare quillwort (Isoetes lacustris), adapted to such conditions, alongside other species typical of naturally low-nutrient glacial lakes. The surrounding upland habitats, encompassing blanket bogs and grasslands, host arctic-alpine associated flora such as sea campion (Silene uniflora), which occurs in the Black Mountains including at Llyn y Fan Fach. The area's fauna is dominated by bird species suited to open and edges. Notable breeding and passage birds include red kites (Milvus milvus), curlews (Numenius arquata), lapwings (Vanellus vanellus), meadow pipits (Anthus pratensis), and ring ouzels (Turdus torquatus). Red kites, a emblematic species in , are frequently observed soaring over the lake and ridges. The site's elevation and remoteness contribute to its value for upland bird populations, with at least 11 bird species recorded within a five-mile radius.

Human Impacts and Conservation

The construction of a dam in the 1920s transformed the natural into a , impounding water for supply to and altering the hydrological regime and surrounding wetlands. This engineering intervention, managed by Dŵr Cymru Welsh Water, has required ongoing maintenance, including recent refurbishments such as glass-reinforced plastic lining of the valve tower to mitigate cracking and deterioration from and water pressure. Agricultural practices, particularly by sheep, have contributed to vegetation loss on heaths and cliffs, while recreational activities like and off-road vehicle use exacerbate path erosion and in the upland areas. Tourism pressures, including rising visitor numbers for trails to the lake, have led to and unauthorized parking along the access road, diminishing the site's remote character and posing risks to road safety and integrity. These impacts are compounded by potential from runoff and nutrient enrichment, which threaten the oligotrophic conditions supporting specialist aquatic plants. As part of the Mynydd Du (SSSI), designated in 1988 for its geological, botanical, and ornithological features—including nutrient-poor lakes with rare quillwort (Isoetes lacustris)—the area receives targeted management to sustain favorable condition, achieved through balanced grazing with cattle or ponies to minimize damage, bracken and scrub control, and erosion mitigation via path surfacing and peat dam repairs. Within Bannau Brycheiniog National Park, visitor management strategies emphasize interpretation to promote low-impact access, monitoring, and collaboration with landowners to prevent operations like uncontrolled burning or drainage that could harm habitats.

Access and Human Use

Trails and Recreation

Llyn y Fan Fach serves as a primary destination for hikers in the Bannau Brycheiniog National Park, with access primarily via trails starting from the Llanddeusant area. The most straightforward route to the lake follows a well-maintained gravel path from the car park near Llanddeusant, covering approximately 2.4 miles round trip with moderate uphill sections but no technical terrain, suitable for most fitness levels and taking about 1-2 hours. Longer circular routes incorporate Llyn y Fan Fach alongside Llyn y Fan Fawr and surrounding ridges like the Carmarthen Fans, spanning 9.3 miles with 2,473 feet of elevation gain, classified as challenging and requiring 5-6 hours to complete. These paths traverse glacial landscapes, escarpments, and ridgelines, offering panoramic views but demanding navigation awareness due to steep slopes and exposed sections. Recreational activities beyond include picnicking at the lake's edge, where visitors enjoy dramatic scenery framed by the Black Mountain , though facilities are minimal and can change rapidly. No organized water-based such as occurs on the lake, preserving its state, and access remains free with available at designated points. Caution is advised for steep drops along trails, particularly near the water's edge.

Tourism and Management

Llyn y Fan Fach attracts hikers, photographers, and enthusiasts to Bannau Brycheiniog National Park, where its and dramatic provide a backdrop for moderate to challenging trails. The main access begins at a small gravel car park off a dead-end lane near Llanddeusant village (grid reference SN 798238), leading to a roughly 4-mile out-and-back hike with 1,500 feet of elevation gain to the lake's edge. Popular extensions form circular routes incorporating Llyn y Fan Fawr and the , spanning up to 9.3 miles and 2,473 feet of ascent, rated as hard difficulty by trail databases. The lake's cultural allure, tied to the medieval legend of the , enhances its draw for visitors beyond physical recreation, positioning it as a site for reflective walks and educational tours on Welsh heritage. Picnic spots overlooking the are promoted for low-impact enjoyment, with the area praised for its accessibility from urban centers like (about 1.5 hours by car) and seasonal beauty across weather conditions. Visitor feedback on platforms like averages 4.8 out of 5 stars from 94 reviews as of 2025, citing stunning vistas and minimal crowds outside peak weekends. Site management is coordinated by the Bannau Brycheiniog National Park Authority and , the latter responsible for the reservoir's operation since its construction between 1914 and 1919 to supply water via the Afon Sawdde. Conservation efforts integrate tourism controls, including path reinforcements to combat erosion from increasing footfall, as highlighted in the park's 2015 Visitor Management Plan, which flags Llyn y Fan Fach for monitoring due to shifts in its remote ambiance from promotional activities. Recent infrastructure upgrades, such as 2024 valve tower refurbishments, mandated biodiversity net gain initiatives to offset works and bolster local habitats. Regulatory measures emphasize sustainable access: visitors must stick to designated paths, refrain from wild camping or littering, and respect , with no facilities like toilets at the to discourage overuse. The park enforces temporary closures for safety or , exemplified by 2020 restrictions amid the to prevent strain on remote rescue services. Broader park policies promote "leave no trace" principles and off-peak visits to sustain the area's ecological integrity within its status.

References

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