This is Llangorse Lake or Lake Syfaddan. It has a circumference of 5 miles and a total area of 327 acres (153 hectares) and is 1 mile long. It is relatively low lying at 154 m above sea level and fringed with 10.2 hectares of extensive reed beds, with species rich grassland and woodland dominated by Alder and Willow.

Llangorse Lake - Brecon Beacons visitor guide showing a virtual tour of 'Llangorse Lake' linked to an interactive map with local and travel information. 360° panoramas from Powys.

Llangorse Lake (Lake Syfaddan) is a popular tourist destination near the northern edge of the Bercon Beacons in Wales, about 8 miles from Brecon. On the north shore is Llangorse village and on the southern shore is Llangasty-Talyllin. The lake is a designated Grade One Site of Special Scientific Interest (since 1954) and is one of the few naturally eutrophic (containing excessive nutrients and subject to algal blooms) lakes in Wales. The lake is the result of glaciation, with water trapped behind moraine deposits. It is fed by Afon Llynfi and various other stream from the surrounding hills.

The region has been occupied since prehistoric times, as evidenced by the Iron Age Crannog on Bwlc Island near the north shore of Llangorse Lake. A well preserved dug-out canoe was found nearby in 1925 and is now preserved in the Brecon Museum.

Llangrose Lake plays host to caravan site, parked cars, a sailing club, cafeteria, and P.G.L. Adventure. It is a popular spot for various water sports, including fishing, sailing and motor boat activities. These need careful management given the ecological importance of the lake.

Car: Llangorse Lake is located eight miles from Brecon on a minor road off the A40.