Eigiau is the famous one for the wrong reasons — the dam burst in 1925, killed sixteen people in Dolgarrog below, and a hundred years on the lake remains shallow and broad rather than the deep impoundment it used to be. Forty-nine hectares of wild brown trout in shadow of Pen Llithrig y Wrach, plus a small relict Arctic char population (transferred from Llyn Peris before the burst). Roughly a mile and a quarter's walk in. Bank only, two-fish limit.
- Lake
- Ordovician volcanics sediment