Mumbai is the capital city of the Indian state of Maharashtra. It is the most populous city in India with an estimated city proper population of 12.4 million as of 2011. Along with the neighbouring regions of the Mumbai Metropolitan Region, it is the second most populous metropolitan area in India, with a population of 21.3 million as of 2016. Mumbai lies on the Konkan coast on the west coast of India and has a deep natural harbour. In 2008, Mumbai was named an alpha world city. It is also the wealthiest city in India, and has the highest number of millionaires and billionaires among all cities in India.
The seven islands that came to constitute Mumbai were home to communities of fishing colonies of the Koli people. For centuries, the islands were under the control of successive indigenous empires before being ceded to the Portuguese Empire and subsequently to the East India Company when in 1661 Charles II of England married Catherine of Braganza and as part of her dowry Charles received the ports of Tangier and Seven Islands of Bombay.