Llyn Llydaw is a lake on the flanks of Snowdon in Caernarfonshire, a long thin lake lying in the bottom of the huge corrie on the east side of the mountain around which Snowdon and its neighbouring peaks sweep. It is overlooked by Snowdon itself, by Garnedd Ugain and Crib Goch to the north, and by Y Lliwedd to the south. One of the major paths up Snowdon begins along the lake.
The name of the lake is Welsh. It means "Brittany lake", though whether this is the derivation one cannot say for sure.
Snowdon is the highest mountain in the British Isles outside the Highlands, reaching 3,650 feet, and Llyn Llydaw is about one-third of the way up to this height, its surface at 1,430 feet feet above sea level.
The Miners' Track crosses the lake itself; at its eastern end; once this was by a narrow causeway built in 1853 but in recent years a more solid causeway has been built, which somewhat spoils the fun.
The Miners' Track and Pyg Track both begin at Pen-y-Pass at the head of the Pass of Llanberis and climb up from there. The Pyg Track takes the immediately higher route along the slope of Crib Goch, while the Miners' Track goes south to skirt Llyn Teyrn then to Llyn Llydaw. After crossing the lake, the track follows its north shore before climbing to Glaslyn then up the steep slope to Snowdon's summit.
The lake featured in Robson Green's Wild Swimming Adventure (ITV December 2009), chosen because it is allegedly the coldest lake in Britain. Green's website states that the water was 7 degrees Celsius, but other Welsh lakes are often colder than this.
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