Marchlyn Mawr
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| Marchlyn Mawr | |
|---|---|
| Location | Snowdonia, Wales |
| Coordinates | |
| 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.

