The Tisza is one of the major rivers of Central Europe. It originates in Ukraine, with the White Tisza in the Chornohora and Black Tisza in the Gorgany range, flows partially along the Romanian border, enters Hungary at Tiszabecs, marks Slovak-Hungarian border, passes through Hungary, and falls into the Danube in central Vojvodina in Serbia. It forms the boundary between the regions of Bačka and Banat. The Tisza drains an area of about 157,186 km². Attila the Hun is said to have been buried under a diverted section of the river Tisza.
The length of the Tisza in Hungary used to be 1419 km. It flowed through the Great Hungarian Plain, which is one of the largest flat areas in central Europe. Since plains can cause a river to flow very slowly, the Tisza used to follow a path with many curves and turns, which led to many large floods in the area.