The Ondava is a river in eastern Slovakia, the northern source river of the Bodrog. Its source is in the Low Beskids (Eastern Carpathian Mountains), near the village Nižná Polianka, close to the border with Poland. It is 142 km (88 mi) long and its basin size is 3,355 km2 (1,295 sq mi).
Near the village Cejkov, the Ondava joins the Latorica and forms the Bodrog river, itself a tributary of the Tisza. The Ondava river is 44% regulated.
Major left tributaries: Mirošovec, Ladomírka, Chotčianka, Brusnička, Oľka and Ondavka.
Major right tributary: Topľa
Minor right tributaries: Olšavanka and Trnávka.
