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Lake Tana is Ethiopia's largest lake and famous for the churches and monasteries on 20 of the lake's 37 islands. The Lake is known as the home of the Monasteries founded on some of the 20 of its 37 Islands.
Lake Tana is fed by the Lesser Abay, Reb and Gumara rivers; and its surface area ranges from 3,000 to 3,500 km,² depending on season and rainfall. The lake level has been regulated since the construction of the control weir where the lake discharges into the Blue Nile. This controls the flow to the Blue Nile Falls (Tis Abbai) and hydro-power station