Lake Mandrensko in the context of "Izvorska reka"

The Burgas Lakes (Bulgarian: Бургаски езера, Burgaski ezera) or Burgas Wetlands (Бургаски влажни зони, Burgaski vlazhni zoni) are a group of coastal lakes of varying saltiness located around the Bulgarian city of Burgas in the proximity of the Black Sea. They constitute the largest group of lakes in the country and comprise some of Bulgaria's biggest and most important lakes.

The lakes' total area (including swamps, marshes, ponds and other reservoirs) amounts to 95 km, of which 33.30 km are either proclaimed or proposed protected areas that are inhabited by a large number of locally or globally endangered species of birds, fish and mammals. Apart from this, the Burgas Lakes are also of economic importance, used to obtain sea salt and curative mud, as well as to supply the local economy with fresh water, in the case of Lake Mandrensko.

The Fakiyska reka (Bulgarian: Факийска река) is a 87 km long river in eastern Bulgaria that flows into Lake Burgas, which drains into the Black Sea.

The river takes its source under the name Garkova reka at an altitude of 463 m in the western part of the Strandzha mountain range, some 1.7 km north of the village of Strandzha just north of the Bulgaria–Turkey border. It initially flows in a deforested valley direction north until the village of Momina Tsarkva, northeast until Fakiya and east until Golyamo Bukovo. It then enters a deep, narrow and forested valley with many meanders, which separates the Strandzhan ridges of Karatepe to the northwest and Bosna to the southeast. Downstream of the abandoned village of Rakov Dol the valley widens and downstream of Zidarovo enters the Burgas Plain, where the Fakiyska reka forms a wide alluvial valley. It flows into Lake Mandrensko some 1.5 km southwest of the village of Dimchevo. The lake itself drains into the Gulf of Burgas in the Black Sea.

The Sredetska reka (Bulgarian: Средецка река) is a 69 km long river in southeastern Bulgaria, which flows into Lake Mandrensko, itself draining into the Black Sea.