The artificial Lake Marathon is an artificial lake that was created to collect water for the supply of Athens. Formed by the construction of Marathon Dam at the confluence of streams, ravines and Barnabas, and a few kilometers from the town of Marathon, Attica.
The Lake Marathon was the main water storage for water supply of Athens since 1931, so began to give water until 1959. In 1959 he began working link for the pond material, while from 1981 most of the water to supply the Greek capital from the artificial lake of Mornos.
Today all the water of Lake Marathon will not be sufficient only for a few days ydrodotiseos Athens.The area of the lake with water at the height of the spillway is 2.45 tetr.chiliometra (2450 acres) and its maximum depth is 54 feet. The lake collects water from an area called river basin area of 118 sq. km. km, with an average yield 14.400.000 m³ per year, with average annual rainfall of about 580 mm. The average volume of the lake is 12.000.000 m³, while the maximum volume (capacity) is 41.000.000 m³ (of which can be distilled 34 million).