Llyn Dinas is a lake near Beddgelert, Gwynedd in north Wales. It is formed by the River Glaslyn.
Llyn Dinas lies on the valley floor a few miles north of Beddgelert at an altitude of about 55 metres above sea level. It has an area of 60 acres (240,000 m2) and is fairly shallow, with the maximum depth only 10 metres. (From Wikipedia)