Mumbai City district in the context of "Salsette Island"

Salsette Island (Portuguese: Salsete, Konkani: साष्टी, romanized: sāṣṭī, Sashti) is an island in Konkan division of the state of Maharashtra, along India's west coast. The cities of Mumbai (Mumbai City district and Mumbai Suburban district), Thane and Mira-Bhayandar (both part of Thane district) lie on it, making it very populous and one of the most densely populated islands in the world. The island forms the central part of the Mumbai Metropolitan Region and has a population of more than 20 million inhabitants living on an area of about 619 square kilometres (239 sq mi).