Llyn Bodgynydd is a lake in the Gwydir Forest in North Wales. It covers an area of some 14 acres (57,000 m2), and lies at a height of 822 feet a.s.l. It is locally known as "Llyn Bod", or "Bod Mawr" (big), distinguishing it from a nearby, but much smaller lake ("Bod Bach" or "Cors Bodgynydd reservoir") to the north-east. Water from the larger lake flows to the smaller. An area beside the smaller lake has been designated the Cors Bodgynydd Nature Reserve due to the rich variety of plant and animal life there.