Lake Polyfytos, Reservoir in Kozani Regional Unit, Greece.

Lake Polyfytos is an artificial reservoir in the Kozani region of northern Greece, created by damming the Aliakmon River. The water body supports hydroelectric generation and irrigation for farming communities in the surrounding area.

The lake came into being in 1974 when a dam was built across the Aliakmon River to harness water power. This project transformed the landscape and created a vital resource for energy production and farming in northern Greece.

On the shore near Roditis stands the Church of Osios Varadatos, built by refugees from Asia Minor after 1922. They named it after the saint's church in Kouvouklia, Bursa, and added a monument inscribed in memory of those who died in Asia Minor and Pontus.

The shoreline and bridges offer accessible viewing points for visitors to experience the water and surrounding landscape. Spring and autumn provide the most pleasant conditions for exploring, with moderate weather and good visibility.

The lake's water is renewed quickly enough to keep it in a mesotrophic state, limiting the buildup of pollutants. About 60 families live from fishing here, and part of the catch is exported to other European countries.