TAPTI, a river of western India. It rises in Betul district of the Central Provinces, flows between two spurs of the Satpura Hills, across the plateau of Khandesh, and thence through the plain of Surat to the sea. It has a total length of 450 m. and drains an area of 30,000 sq. m. For the last 32 m. of its course it is a tidal river, but is only navigable by vessels of small tonnage; and the port of Swally at its mouth, famous in Anglo-Portuguese history, is now deserted, owing to silting at the outflow of the river. The waters of the Tapti are nowhere used for irrigation.