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. The Ondava flows south through the towns of Svidník, Stropkov and Trhovište, and through the Ondavská Highlands. It is long and its basin size is .Plán manažmentu povodňového rizikavčiastkovom povodí Bodrogu , p. 51
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.Danube Facts and Figures – The Slovak Republic (March 2007). (.pdf). Retrieved October 30, 2007.
Tributaries Major left tributaries – Mirošovec, Ladomírka, Chotčianka, Brusnička, Oľka and Ondavka. Major right tributary – Topľa. Minor right tributaries – Olšavanka and Trnávka.Geographical coverage of the Bodrog River Basin District and list of appropriate competent authorities. (.doc). Retrieved October 30, 2007.
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