Llyn Llydaw (from the Welsh meaning Brittany lake) is a 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 looked at lakes in the United Kingdom. Thousands of people every year visit Snowdon and most walk right past this lake on the Miners' Track. It is not a natural lake.