Mumbai is the capital city of the Indian state of Maharashtra
It is the most populous city in India and the ninth most populous agglomeration in the world, with an estimated city population of 18.4 million. Along with the neighbouring regions of the Mumbai Metropolitan Region, it is one of the most populous urban regions in the world and the second most populous metropolitan area in India, with a population of 21.3 million as of 2016. Mumbai lies on the Konkan 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 GDP of any city in South, Western, or Central Asia. Mumbai 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. During the mid-18th century, Bombay was reshaped by the Hornby Vellard project, which undertook reclamation of the area between the seven islands from the sea. Along with construction of major roads and railways, the reclamation project, completed in 1845, transformed Bombay into a major seaport on the Arabian Sea. Bombay in the 19th century was characterised by economic and educational development. During the early 20th century it became a strong base for the Indian independence movement. Upon Indias independence in 1947 the city was incorporated into Bombay State. In 1960, following the Samyukta Maharashtra Movement, a new state of Maharashtra was created with Bombay as the capital.
Source: Wikipedia