Bourgas Lake is a shallow lime on the Black Sea coast west of Bourgas.

It is а part of the Bourgas Lake Complex and after the construction of the Mandra reservoir in 1963, the largest natural lake in Bulgaria. Its length is 9.6 km, the width is 2.5 to 5 km, the area it occupies is 28 km2, and the depth reaches till 1.3 m. The lake is separated from the Black Sea by the sandy Kumluka and is connected to it by a tight channel. Above the lake passes Via Pontica - one of the great airways of migratory birds from all over Europe. In it nests 254 species of birds, 61 of which are included in the Red Book of Bulgaria.