Llangorse Lake

Llangorse Lake (Welsh: Llyn Syfaddon, variant: Llyn Syfaddan) is the largest natural lake in Mid and South Wales, and is situated in the Brecon Beacons National Park,[1] near the town of Brecon and the village of Llangors.
The lake is famous for its coarse fishing (particularly pike), watersports, the afanc (a monster nicknamed 'Gorsey') and has the only example of a crannog in Wales. Llangorse Lake is also one of the most mentioned sites in Welsh folklore. It is a site of international conservation importance.
Due to the lake's long history of human activity, it has been known by several different names during its history, both in the Welsh language and in English: other names include the lake's original Welsh name, Llyn Syfaddon/Syfaddan, and Brycheiniog Mere. The name Llangorse Lake is comparatively recent.
Llangorse Lake is a eutrophic glacial lake with a three-mile (5 km) perimeter covering an area of 139 hectares (340 acres). The lake is one mile (1.6 km) long, is 505 feet (154 m) above sea level and has a maximum depth of 7.75 m (25 ft 5 in).[2][3][4] It occupies a glacially scoured rock basin partly enhanced by morainic debris[5] within the drainage basin of the River Wye but close to that of the River Usk to the south. The Afon Llynfi provides the main input of water into the lake and continues as the lake overflow stream.

[@wplno1]

Great video, nicely edited.

[@pikemaster1972]

Had my first pike there