Llyn Dulyn (Black Lake)
Llyn Dulyn is a small cirque lake bound by the high cliff faces of Garnedd Uchaf and Foel Grach on the edge of the Carneddau mountains. It is approximately 33 acres in area, has a mean depth of 104 feet, and is 189 feet at its deepest point. The lake has a dam which was constructed in 1881, and it now serves a reservoir for Llandudno.

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