| Grüner See | |
| Location: | Hundelshausen, Hesse |
| Coords: | 51.2956°N 9.8542°W |
| Pushpin Map: | Hesse |
| Basin Countries: | Germany |
| Area: | ca. 5000m2 |
| Elevation: | 220m (720feet) |
Grüner See is a lake in Hundelshausen, Hesse, Germany.[1] At an elevation of 220m (720feet), its surface area is ca. 5000sqm.
The Green Lake, which is partially surrounded by steep slopes, was formed in 1940 when an abandoned open-cast mining pit from a gypsum quarry filled with groundwater, precipitation, and surface water. Its green color is due to its abundance of phytoplankton.