The Aytoska reka (Bulgarian: Айтоска река) is a 32.5 km long river in eastern Bulgaria that flows into Lake Burgas, which drains into the Black Sea.

[1] The river takes its source in the western part of the Aytoska Planina division of the eastern Balkan Mountains at an altitude of 344 m, some 2.5 km north of the village of Lyaskovo.

It flows in direction south–southeast through the Burgas Plain in a wide valley.

The lake itself drains into the Gulf of Burgas in the Black Sea.

The average annual flow near the town of Kameno is 0.60 m3/s.