The Warta is the third longest river in Poland. Its sources are located in Kromołów, which is a district of Zawiercie. It flows into the Oder river at Kostrzyń. The upper part of the river is very scenic and it is worth visiting, while kayaking from Częstochowa to any point in its lower reaches of the river. The Mirowski Rapid is particularly interesting, where the Warta breaks through limestone rocks of the Kraków-Częstochowa Upland.