Lake Tana (also spelled T'ana,
Amharic: ጣና ሐይቅ Ṭānā Hāyḳ,"Lake Tana," an older variant is Tsana,
Ge'ez ጻና Ṣānā; sometimes called "
Dembiya" after the region to the north of the lake) is the source of the
Blue Nile and is the largest
lake in
Ethiopia. Located in the north-western
Ethiopian highlands, according to the Statistical Abstract of Ethiopia for 1967/68, the lake is approximately 84 kilometers long and 66 kilometers wide, with a maximum depth of 15 meters, and an elevation of 1,840 meters. Lake Tana is fed by the Little Abay, Reb and Gumara Rivers and its surface area ranges from 3,000 to 3,500 km² 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, which regulates the flow to the Tis Abay falls and hydro-power station.
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