 |
| Lake Mandrensko | |
|---|---|
| Мандренско езеро (Bulgarian) | |
 The water surface and an island | |
  Lake Mandrensko | |
| Location | Burgas Province, Bulgaria |
| Group | Burgas Lakes |
| Coordinates | 42°25′24″N 27°23′29″E / 42.42333°N 27.39139°E |
| Type | natural lake, reservoir |
| Primary inflows | Izvorska Fakiyska Sredetska Rusokastrenska |
| Primary outflows | Black Sea |
| Basin countries | Bulgaria |
| Built | 1963 |
| Max. length | 8 km (5.0 mi) |
| Max. width | 1.3 km (0.81 mi) |
| Surface area | 38.84 km2 (15.00 sq mi) |
Lake Mandrensko or Lake Mandra (Bulgarian: Мандренско езеро, Mandrensko ezero) is the southernmost of the Burgas Lakes, located in the immediate proximity of the Black Sea and close to Burgas in Bulgaria. Being 8 km long and 1.3 km wide at maximum, as well as having an area of 38.84 km², it was a brackish natural lake until 1963, when it was turned into a reservoir with the construction of a dam to secure fresh water for the large Neftochim Burgas oil refinery. The rivers Izvorska reka, Fakiyska reka, Sredetska reka and Rusokastrenska reka flow into the lake.
Parts of Lake Mandrensko are designated protected areas, Poda and Uzungeren, inhabited by a number of locally and globally endangered species of fish and birds.