Lake Tsivlou is located in the prefecture of Achaia on Mount Helmos, at an altitude of 800m.
It was created on March 24, 1913, when a large landslide caused the Krati river to be blocked.

The lake has a surface of about 83 acres and a depth of about 80 meters.

Around and near the lake are the villages of Peristera, Agia Varvara, and Zarouchla. The name of the lake comes from the village of Tsivlos which was partially submerged after the landslide.

Today Tsivlou Lake is an important wetland that hosts many species of flora and fauna. It is also a popular leisure and promenade destination.