Warta - river in Poland

"The Warta is a river in western-central Poland and a tributary of the Oder. With a length of approximately 808.2 kilometres (502.2 mi), it is the country's second-longest river located within its borders and third-longest in terms of total length. The Warta has a basin area of 54,529 square kilometers (21,054 sq mi) and it is navigable from Kostrzyn nad Odrą to Konin, approximately half of its length. It is connected to the Vistula by the Noteć River and the Bydgoszcz Canal near the city of Bydgoszcz. - Wikipedia"