|Type||natural lake, reservoir|
|Primary inflows||Izvorska, Fakiyska, Sredetska and Rusokastrenska|
|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. 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, Fakiyska, Sredetska and Rusokastrenska flow into the lake.
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