Mumbai, formerly known as Bombay, is the capital city of the Indian state of Maharashtra. It is the most populous city in India, and the fourth most populous city in the world, with a total metropolitan area population of approximately 20.5 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. In 2009, 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, West or Central Asia. Mumbai has been ranked 6th among top 10 global cities on billionaire count, ahead of Shanghai, Paris and Los Angeles.The capital city of Maharashtra, Mumbai, is fondly known as the ‘city that never sleeps’. This fast moving city of India is also the commercial, financial as well as entertainment capital of the country. Mumbai is one of those cities of India which is known for its historical significance, it is a city of varied cultural heritage. Owing to its historical significance, Mumbai has numerous places of tourist interst. The city is originally made of seven islands.