Llyn Llydaw

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Llyn Llydaw
Llyn Llydaw.jpg
Llyn Llydaw seen from the summit of Snowdon
Llyn Llydaw is located in Gwynedd
Llyn Llydaw
Llyn Llydaw
LocationSnowdonia National Park, Wales
Coordinates53°4′7″N 4°2′50″W / 53.06861°N 4.04722°W / 53.06861; -4.04722Coordinates: 53°4′7″N 4°2′50″W / 53.06861°N 4.04722°W / 53.06861; -4.04722
Lake typenatural, reservoir
Basin countriesUnited Kingdom
Surface area110 acres (45 ha)
Surface elevation436 m (1,430 ft)

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. 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. Higher up lies Glaslyn, and lower down lies Llyn Teyrn.

In 1905, a 2 kilometres (1.2 mi) pipeline was built from the lake into the valley below. Water from the lake powers the Cwm Dyli hydro-electric power station 320 metres (1,050 ft) below. The pipeline and power station continue to operate in 2019.

Popular culture[edit]

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° Celsius,[1] but other Welsh lakes are often colder than this.[citation needed]


  1. ^ "Archived copy". Archived from the original on 22 December 2009. Retrieved 28 December 2009.CS1 maint: archived copy as title (link) Robson Green website

External links[edit]