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19°32′N 72°53′E / 19.533°N 72.883°E The Tansa River is a small river near Mumbai, India and is one of Mumbai's water sources via Tansa Lake. It is embanked by a dam built in 1892, which was then one of the largest masonry dams in the world. The embankment is nearly 2 miles long, 118 ft (36 m) high, and 30 metres thick at the base.[1] The dam has 1.31 cubic kilometres capacity of water retention. The dam has about 38 spillway gates.