Lake Tisza is the largest artificial lake in Hungary. It is located at the southeastern edge of Heves county.
Lake Tisza is 27 km in length, with an average depth of 1.3 m and a maximum depth of 17 m; it contains 43 km² of small islands.
Lake Tisza Ecocentre in Poroszló was erected to collect and display the nature and wildlife of the Tisza River valley and Lake Tisza. It was opened to the public on 27 April 2012.
As part of the ongoing Tisza River flood control project, the Tisza Dam was built in 1973. Its filling was finished in the 1990s, resulting in a 127 km² lake.
A significant part of Lake Tisza, which belongs to the Hortobágy National Park, and Ramsar Convention is a nature conservation area.
The lake can be divided into three parts. That north of Highway 33 is a bird reserve and part of Hortobágy National Park, as is the middle portion with its giant white water lilies and colonies of heron and cormorant that can be visited by following established trails. Other parts of the lake, the Sarud and Tiszafüred basins and the southern Abádszalók section, are where the splashing and sporting take place.
The Geographic Coordinates of Lake Tisza: 47°36′N 20°40′E