Salsette Island is an island in Konkan division of the state of Maharashtra, along India's west coast. Administratively known as the Mumbai Suburban district, Mira Bhayander & a portion of Thana lie on 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 areā¦Salsette Island is an island in Konkan division of the state of Maharashtra, along India's west coast. Administratively known as the Mumbai Suburban district, Mira Bhayander & a portion of Thana lie on 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.