Lake Kastraki is an artificial lake in western Greece in the Acheloos riverbed at the junction of Inachos tributary. The lake is fed by the rivers Acheloos and Inachos. .It was formed by the Kastraki Dam, which was completed in 1969. The area of the lake is about 28 aquare kilometers and its maximum capacity is 950,000,000 m³ of water. It is used for the generation of hydroelectric power, saving considerable energy by not using oil without harming the environmet.

Although Lake Kastraki is artificial it fits fully in the natural environment offering an evergreen scenery.