The water surface and an island
|Type||natural lake, reservoir|
|Primary inflows||Izvorska, Fakiyska, Sredetska and Rusokastrenska|
|Max. length||8 km|
|Max. width||1.3 km|
|Surface area||38.84 km²|
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.
Parts of Lake Mandrensko are designated protected areas inhabited by a number of locally and globally endangered species of fish and birds.
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