Khanderi is an island with a fort, located south of Mumbai, along the coast of Maharashtra, India. Khanderi is located 5 km off the coast of Maharashtra and 20 km south of Mumbai. Khanderi, along with its sister fort Underi formed the major fortification along the Maharashtra coast, the former falling under Shivaji Maharaj's control and the latter under his …Khanderi is an island with a fort, located south of Mumbai, along the coast of Maharashtra, India. Khanderi is located 5 km off the coast of Maharashtra and 20 km south of Mumbai. Khanderi, along with its sister fort Underi formed the major fortification along the Maharashtra coast, the former falling under Shivaji Maharaj's control and the latter under his opponents, the Siddis. The island consists of two high hills, one facing north and the other facing south. Initially, the islands of Underi and Khanderi were uninhabited. It contained two wells to supply water to the forces within, and a temple of Sri Betal. The fort is a restricted area, which falls under the jurisdiction of the Indian Navy.