Nonnenmattweiher
| Nonnenmattweiher Nature Reserve | |
|---|---|
IUCN category IV (habitat/species management area) | |
View of the Nonnenmattweiher | |
| Location | Kleines Wiesental, Lörrach, Baden-Württemberg, Germany |
| Coordinates | 47°47′41″N 7°47′57″E / 47.79472°N 7.79917°E |
| Area | 0.708 km2 (0.273 sq mi) |
| Elevation | 910–1,070 m (2,990–3,510 ft) |
| Established | 31 July 1987 |
| Administrator | Regierungspräsidium Freiburg |
| WDPA: 164836 | |
The Nonnenmattweiher is a lake that has been impounded by an embankment in the Southern Black Forest in Germany. Together with the surrounding area it forms a nature reserve of the same name in the High Black Forest in the state of Baden-Württemberg.