The Aterenska reka (Bulgarian: Атеренска река) is a river in southern Bulgaria and northeastern Greece, a right tributary of the Arda of the Maritsa drainage.

[1] The river takes its source from a spring near the village of Cherni Rid in the Sarta Ridge of the eastern Rhodope Mountains at an altitude of 569 m. It flows eastwards in a narrow forested valley, which widens after the crossing of the road Ivaylovgrad–Mandritsa.

East of the village of Drabishna the river leaves the territory of Bulgaria and enters Greece.

[1] The Aterenska reka flows entirely in Haskovo Province of Bulgaria and Evros Regional Unit of Greece.

[1] There are several landmarks along its course in Bulgaria, including the ruins of the medieval fortress of Lyutitsa about one kilometer south of the river, the late medieval Aterenski Bridge 1.6 km northwest of the fortress, and Villa Armira, the best preserved Roman villa in the country, situated 2 km downstream of the bridge, south of the town of Ivaylovgrad.