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The Lac du Val-Joly is an artificial lake in France, constructed before the 1970s.
| Lac du Val-Joly | |
|---|---|
  Lac du Val-Joly | |
| Location | Nord département, Hauts-de-France, France |
| Coordinates | 50°06′54″N 4°08′07″E / 50.1151°N 4.1352°E |
| Type | reservoir |
| Surface elevation | 183 metres (600 ft) |
Located 2 kilometres (1.2 mi) from the Belgian border, and close to Willies in the Nord département, 183 metres (600 ft) asl on the course of the Helpe Majeure, a tributary of the Sambre.
It was created with a dam to help regulate the flow of the Helpe Majeure, and also as a hydropower source, and as a source of water to cool the old thermal power station, Pont-sur-Sambre.
The lake has many species of fauna (some introduced by humans), and is currently classified as a Special Area of Conservation.
