Mumbai is the capital city of the Indian state of Maharashtra. Mumbai is the de facto financial centre and the most populous city of India with an estimated city proper population of 12.5 million (1.25 crore). Mumbai is the centre of the Mumbai Metropolitan Region, the sixth most populous metropolitan area in the world with a population of over 23 million (2.3 crore) living within the Mumbai Metropolitan Region. 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.