Llyn Llydaw (welsh for lake Brittany) is one of the lakes you pass if you go from Pen-y-pas via the Miners track to the foot of Snowdon. This location makes it to one of the most visited lakes in the UK. It is up to 200 feet deep but it contains no fish; it is also considered to be one of the coldest lakes in the UK with 7°C and it is a candidate for an Excalibur lake (a lake from which Excalibur came and eventually returned on the mortal wounding of King Arthur - there are about 10 candidates but due to the location Llyn Llydaw is a quite unlikely one).
The causeway in the foreground was built in 1853 to replace the horse drawn rafts which transported the extracted copper from the copper works further up the shore. You can still see the remains of the old copper works if you follow the Miners track further towards Snowdon.
External links to Llyn Llydaw:
Wales (Cymru in the Welsh language) is part of the United Kingdom of Great Britain and Northern Ireland. The major cities are Cardiff, Swansea, Newport and Bangor. The city of St. Davids is the smallest city in the UK with a population around 2000. Wales itself has a population of around 3 million. The Welsh language is spoken by around 20% of the population.