| Lac Brenet | |
|---|---|
| Vallée de Joux with Lac de Joux to the left and Lac Brenet to the right | |
| Location | Vaud |
| Lake type | natural lake, reservoir |
| Primary outflows | underground |
| Basin countries | Switzerland |
| Max. length | 1.5 km |
| Max. width | 500 m |
| Surface area | 0.80 km² |
| Max. depth | 18 m |
| Surface elevation | 1002 m |
Lac Brenet is a lake in the Vallée de Joux, canton of Vaud, Switzerland. It is located north of the Lac de Joux, only 200 meters away. Its elevation of 1002 meters is 2 meters below that of Lac de Joux.
The lake used to drain naturally underground and the water resurfaced at the source of the Orbe River. Today the lake is used as a reservoir of the hydroelectric plant at Vallorbe.
It is not to be confused with Lac des Brenets.