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 one of the largest masonry dams in the world, built in 1892. The embankment is nearly 2 miles long, 118 ft (36 m) high, and 30 metres thick at the base. The dam has 1.31 cubic kilometres capacity of water retention.