Chennai (Tamil: சென்னை; ˈtɕennəj), formerly known as Madras (Tamil: மெட்ராஸ் or மதறாஸ்; ) or Madarasapatinam (Tamil: மதராசப்பட்டினம்), is the capital city of the Indian state of Tamil Nadu, located on the Coromandel Coast off the Bay of Bengal. Chennai is the fourth most populous metropolitan area and the sixth most populous city in India. As of 2011, Chennai had a population of 4.68 million within the area administered by the Chennai Corporation and an extended metropolitan population of nine million