Llyn Park (also known as "Llyn y Parc") is a lake in the Gwydir Forest in North Wales. Lying at a height of 664 feet, it covers an area of 22 acres (89,000 m2), and is long and narrow in shape. A natural lake, the building of a dam at the southern end raised the level to provide water to drive machinery at the nearby Aberllyn lead and zinc mine, which in 1900 employed some 200 men. The outflow of the lake today passes the ruined remains of the mills before joining the River Conwy. The high (though reducing) level of lead in the water means that there are no fish in the lake.