Llyn Llydaw
 Llyn Llydaw (from the Welsh meaning Brittany lake) is a natural lake in Snowdonia National Park on the flanks of Snowdon Wales' highest mountain. This long thin lake has formed in a cwm about one-third of the way up the mountain. Its special significance is that it is one of the most visited lakes in the United Kingdom. Thousands of people every year visit Snowdon and many walk past this lake on the Miners' Track.Llyn Llydaw is the largest of the three lakes on Snowdon's eastern flank.