Tsivlos Lake is located in Achaia region, on mount Helmos, at an altitude of 800 meters. It was created on the 24th of March 1913, when a large landslide blocked the riverbed of Krathis River. The lake has a surface area of 20 acres and a depth of 80 meters. Around and near the lake are the villages Peristera, St. Barbara and Zarouchla.

The name of the lake comes from the village Tsivlos that was partially submerged after the landslide. Tsivlos Lake is nowadays a very important wetland, home to many species of flora and fauna. It is a popular leisure destination.