Lake Tisza, also known as Kisköre Reservoir, is the largest artificial lake in Hungary. It is located at the southeastern edge of Heves county, next to counties Borsod-Abaúj-Zemplén, Hajdú-Bihar and Jász-Nagykun-Szolnok. As part of the ongoing Tisza River flood control project, the Tisza Dam was built in 1973.