Best lakes around Myddfai are found in Carmarthenshire, Wales, a region known for its natural beauty and rich folklore. The area features significant water bodies, particularly those tied to the legend of the Lady of the Lake. These include glacial lakes nestled within the Black Mountain escarpment and a large reservoir offering outdoor activities. The landscape provides rugged beauty and opportunities for hiking and scenic views.
Last updated: October 3, 2026
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The views down onto Llyn Y Fawr from here is pretty spectacular. This is one of the nicest places in the Brecon Beacons to walk along. Once you have put in the effort to get here, the ridge has a good footpath, there's a nice walled shelter and the views down towards the lake is pretty awesome on a good day.
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Excellent track around the reservoir suitable for most bikes with gravel tyres. The Usk Reservoir, also known as Cronfa Wysg in Welsh, sits at an elevation of 1,006 feet (307 m) in the upper Usk Valley within the Brecon Beacons National ParK. It marks the county boundary between Carmarthenshire and Powys.
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A quieter route that leads to the lake. Beautiful and challenging. ideal for all weathers.
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Fan Brycheiniog is the highest peak at a height of 802.5 metres in the Black Mountain region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on the edge of the escarpment, and nearby, a stone shelter with an inner seat.
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Fan Brycheiniog is the highest peak at a height of 802.5 metres in the Black Mountain region of the Brecon Beacons National Park in southern Wales. There is a trig point at the peak and on the edge of the escarpment, and nearby, a stone shelter with an inner seat.
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Llyn y Fan Fawr is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog, the highest peak of the Black Mountain range within the Brecon Beacons National Park. Created as a result of glacial action, it is one of the largest glacial lakes in southern Wales. The lake is roughly rectangular in shape with its long axis oriented roughly north–south.
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Picws Du is the second highest peak of the Carmarthen Fans in the Carmarthenshire section of the Black Mountain in the west of the Brecon Beacons National Park in south Wales.Picws Du is formed from the sandstones and mudstones of the Brownstones Formation of the Old Red Sandstone laid down during the Devonian period. Its summit and southern slopes are formed from the hard-wearing sandstones of the overlying Plateau Beds Formation which are of upper/late Devonian age.
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The most popular lakes include Llyn y Fan Fach, known for its stunning beauty and the legend of the Lady of the Lake, and Llyn y Fan Fawr, offering dramatic mountain scenery. For a more accessible experience, Usk Reservoir is a family-friendly option with a track suitable for walking or riding.
Yes, Usk Reservoir is particularly family-friendly, featuring a track around its perimeter that is suitable for easy walking or riding. While the walk to Llyn y Fan Fach can be an uphill slog, it's a popular five-mile walk that many families enjoy for the stunning views.
The area offers extensive opportunities for outdoor activities. You can enjoy hiking, cycling, and mountain biking. For cycling, explore routes like the 'Trecastle and Myddfai loop from Usk Reservoir' found in the Cycling around Myddfai guide. Mountain biking enthusiasts can check out the 'Usk Reservoir and Glasfynydd Forest loop' in the MTB Trails around Myddfai guide. Running is also popular, with routes like the 'Usk Reservoir running loop' available in the Running Trails around Myddfai guide.
The lakes, especially Llyn y Fan Fach, are deeply rooted in Welsh folklore. It is famously associated with the ancient legend of the 'Lady of the Lake,' a magical woman who emerged from its waters. Her sons became the fabled Physicians of Myddfai, adding a profound sense of magic and history to the location.
Absolutely. The summit of Picws Du offers amazing views across Llyn y Fan Fach and the valley. Similarly, from the Fan Brycheiniog summit, you can get spectacular views down onto Llyn y Fan Fawr and the rugged landscape, especially on a clear day.
The lakes offer beauty year-round. While a hot summer's day is ideal for activities like wild swimming at Llyn y Fan Fawr, the 'otherworldly' atmosphere of Llyn y Fan Fach makes it a compelling visit regardless of the weather, even on a cold winter's morning. The views over the lake on a sunny day or sunset are particularly magical.
While swimming has been discouraged by recent signs at Llyn y Fan Fach, Llyn y Fan Fawr has been described by visitors as an iconic wild swimming spot for ages, perfect on a hot day. Be aware that the water can be quite cold.
There is a car park near Llyn y Fan Fach, though it is small and can get busy. The roads leading to it can be tight, so drive slowly. For Usk Reservoir, there are parking areas available to access the perimeter track.
The region is characterized by its rugged river landscapes and the surrounding Tywi Forest. The lakes themselves are often glacial, nestled beneath dramatic escarpments like the Black Mountain within the Brecon Beacons National Park. You'll find deep, cold waters, and stunning panoramic views of the surrounding mountains.
Yes, Llyn y Fan Fawr is often incorporated into longer hiking routes that also include Llyn y Fan Fach. These routes offer an expansive wilderness experience and allow you to explore the dramatic mountain scenery of the Black Mountain range.
Visitors frequently praise the breathtaking scenery, the sense of mystique from the folklore, and the opportunities for outdoor adventure. The 'otherworldly' atmosphere of Llyn y Fan Fach and the dramatic mountain views from peaks like Fan Brycheiniog are often highlighted. Many also appreciate the peacefulness and the chance to immerse themselves in nature.
Yes, Usk Reservoir features a brilliant track around its perimeter that is suitable for cycling, even with bikes with 35mm+ wheels. It offers an easy route for riding and picturesque vistas.


Still not found your perfect lake around Myddfai? Check out the guides of these regions to see even more beautiful places.