Cwellyn is one of the few Welsh waters with a natural Arctic char population — eighty-seven hectares of deep glacial lake (max 37 m) on the Afon Gwyrfai, at the foot of Snowdon. SAC-designated. Wild brown trout shoreward; char in the deep water (you'll need a boat to fish them properly), and the occasional salmon working up the Gwyrfai. The setting is what it is — Snowdon's western flank behind you, Moel Eilio in front.
- Lake
- Ordovician volcanics

