Llyn Ogwen (Welsh: [ˈɬɪn ˈɔɡʊɛn]) is a ribbon lake in north-west Wales.

It is fed by a number of streams from the slopes of the mountains which surround it, which include Tryfan and Pen yr Ole Wen.

[1] According to the writer Jonah Jones:"J. M. Archer Thomson,[2] a headmaster of Llandudno School and a pioneer rock climber in Snowdonia quotes a strange legend from a Welsh magazine concerning Llyn Ogwen.

In the midst of the commotion caused by this intrusion, he turned to the lake, and 'behold thereon a coracle in which sat three women of more than mortal beauty, but the dread aspect of the rower would have filled the stoutest heart with terror.'

E. W. Steeple, who recorded this legend, suggests it 'seems a little obscure, and it may be that it has become involved with another story', probably that of Llyn Llydaw.