Llyn Llydaw is a natural and long lake in Snowdonia National Park, Wales. It is the widest of the three lakes on Snowdon's eastern part, Wales's highest mountain with a height of 1085 metres (3560 feet). Llyn Llydaw is one of the most visited lakes in Britain, many people visiting every year Snowdon. It is also a swimming spot suitable for dip, swim and a family friendly lake. It is one of the two lakes of the northern Wales with a legend of being the lake where Sir Bedivere threw Excalibur, King Arthur's sword, the other lake with the same claim being Llyn Ogwen.