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Warta (vär´tä), river, c.475 mi (760 km) long, rising in the Jura Krakowska, S Poland, and flowing N and W past Częstochowa and Poznań to the Oder River at Kostrzyn. It is connected with the Vistula River by the Noteć River, its tributary, and by the Bydgoszcz Canal. The Warta is navigable for large craft to Poznań and for small craft for about half its course. The lower course of the river, formerly in Germany, became (1945) part of Poland as a result of the Potsdam Conference.