Stratos lake, reservoir in Aetolia-Acarnania, Greece

Stratos lake is a reservoir created in 1989 by damming the Acheloos River in the Aetolia-Acarnania region of western Greece. The water surface spans roughly 7.4 square kilometers and is held back by an earthen dam standing about 26 meters (85 feet) high and extending more than 1,000 meters (3,280 feet) across the river valley.

The reservoir was completed in 1989 when the earthen dam on the Acheloos River became operational for hydroelectric power generation. The project was part of Greece's broader effort to develop renewable energy and manage water resources across the western region.

The reservoir lies near Stratos in Aetolia-Acarnania, reached from the surrounding villages of the Agrinio municipality; the dam itself is the main orientation point. The small irrigation reservoir below the Stratos dam is assigned to the Hellenic Water Ski Federation and hosts the National Water Ski Centre, so the water is used for training and events. The Matsouki Environmental Centre operates in the area.

Below the main Stratos dam, the reservoir of a smaller irrigation dam is leased to the Hellenic Waterski Federation and hosts the facilities of the National Waterski Centre. The Matsouki Environmental Centre also operates in the area, so the same lake serves both power generation and water sports.