Lac de Pormenaz is an alpine lake in the Passy National Nature Preserve (Réserve naturelle nationale de Passy) of the Haute-Savoie department of France. Its surface area of 4.4 ha is at an elevation of 1945 m.
| Lac de Pormenaz | |
|---|---|
| Location | Haute-Savoie |
| Coordinates | 45°57′44″N 6°47′38″E |
| Basin countries | France |
| Surface area | 4.4 ha (11 acres) |
| Surface elevation | 1,945 m (6,381 ft) |
The lake can be reached by foot from the village of Plaine Joux above Servoz.

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