�� Llyn Cowlyd

Llyn Cowlyd is the deepest lake in northern Wales. It is a reservoir in the Snowdonia National Park at the upper end of Cwm Cowlyd on the south-eastern edge of the Carneddau range of mountains, at a height of 370 metres (1,210 ft) above sea level. The lake is long and narrow, measuring 3.0 kilometres (1.9 mi) long and up to about 400 metres (440 yd) wide, and covers an area of about 1.1 square kilometres. It has a mean depth of 33 metres (108 ft) and at its deepest has given soundings of 70 metres (230 ft), this being some 14 m (46 ft) greater than its natural depth, the water surface having been raised twice by the building of dams.