Cwm Dwythwch is a high, small tarn on the society's books, easy to overlook next to the club's better-known waters but no less honest for it. It holds trout in the way these upland tarns generally do — not abundant, not large, but wild and willing on their day. The practical appeal is the ticketing: it's bookable through The Fishing Passport, and a single £20 all-waters ticket covers the club's full portfolio, Cwellyn and Padarn and Dywarchen and Cwm Silyn and Nantlle included. That makes Dwythwch less a destination in its own right and more a bonus water — somewhere to detour to on a day when you've already paid for the privilege of being up here.
- Lake
- Ordovician volcanics
