Marchlyn Mawr

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Marchlyn Mawr
Location Snowdonia, Wales
Coordinates 53°8′12″N, 4°4′9″WCoordinates: 53°8′12″N, 4°4′9″W
Lake type reservoir
Basin countries United Kingdom

Marchlyn Mawr reservoir is a high level lake in Snowdonia behind Elidir Fawr mountain. It is used as the high level water source for Dinorwig power station, a pump storage hydroelectricity scheme.

It is said that nearby lies the cave containing Arthur's treasure, a source of dazzlement to the wanderer who sees it, and of disaster to the pilferer who touches it.

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