Madurai is a major city in the Indian state of Tamil Nadu. It is the administrative headquarters of Madurai District. Madurai is the third largest city in Tamil Nadu, and is the 25th populated city in India. Located on the banks of River Vaigai, Madurai has been a major settlement for two millennia. Madurai has been selected as one of the hundred Indian cities to be developed as a smart city under Prime Minister Narendra Modi's flagship Smart Cities Mission.