or Lake Mandra
(Мандренско езеро) 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.