Vasai Creek, previously Bassein Creek, is an estuary and one of the two main distributaries of the Ulhas River, in Konkan division of Maharashtra, India. The Ulhas splits at the northeast corner of Salsette island into its two main distributaries, the other one being the Thane Creek, both of which empty into the Arabian Sea. The creek forms the northern boundary of Salsette island and separates the island from mainland of Konkan. It gets its name from the city of Vasai, previously Bassein, located on northern banks of the creek.