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