Salsette Island is an island in Konkan division of the state of Maharashtra, along India's west coast. Administratively known as Greater Mumbai, the Mumbai Suburban district, Mira Bhayander and a portion of Thane district lie within it, making it very populous and one of the most densely populated islands in the world. It has a population of more than 20 million inhabitants living on an area of about 619 square kilometres (239 sq mi).

Mira-Bhayandar is a city and municipal corporation in Thane district in the state of Maharashtra, India located in the northern part of Salsette Island before the Vasai Creek, and shares a border with North Mumbai. Mira-Bhayandar is administered by Mira-Bhayandar Municipal Corporation (MBMC), with a population at the 2011 Census of 809,378. Mira-Bhayandar is a part of Mumbai Metropolitan Region (MMR) and Mira-Bhayander, Vasai-Virar (MBVV) Police Commissionerate.