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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, 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.