The Karaagach (Bulgarian: Караагач), also known as Kitenska reka (Китенска река),[1] is a 36 km long river in Burgas Province, southeastern Bulgaria.

The river is rich in rare fish species and has varied flora.

The river takes its source under the name Stara Vizitsa at an altitude of 331 m, some 400 m northeast of the summit of Demira (424 m) in the Bosna Ridge of the Strandzha mountain range.

It flows into the Black Sea in the southeastern part of the small Karaagach bay, at 800 m south of the town of Kiten on the territory of the Tsarevo Municipality.

Its drainage basin covers a territory of 182 km2[2] and borders the drainage basins of the Dyavolska reka to the north and west, the Veleka to the south and southwest, and several small rivers flowing into the Black Sea to the east.