Mumbai (pronounced /mʊmˈbaɪ/; Marathi: मुंबई, Mumbaī), previously officially known as Bombay, is the capital of the Indian state of Maharashtra. It is the most populous city in India, and the most populous city in the world, with a population of approximately 14 million. Along with the neighbouring urban areas, including the cities of Navi Mumbai and Thane, it is one of the most populous urban regions in the world. Mumbai lies on the west coast of India and has a deep natural harbour. As of 2009, Mumbai was named an Alpha world city. Mumbai is also the richest city in India, and has the highest GDP of any city in South or Central Asia.