Thoothukudi is a port city, a municipal corporation, and an industrial city in Thoothukudi district in the Indian state of Tamil Nadu. The city lies on the Coromandel Coast of the Bay of Bengal. Thoothukudi is the capital and headquarters of Thoothukudi district. It is located about 590 kilometres southeast of Chennai, 190 kilometres northeast of Thiruvananthapuram, and 580 kilometres southeast of Bengaluru. According to the Confederation of Indian Industry, Thoothukudi has the second highest Human Development Index in Tamil Nadu, next to Chennai. Thoothukudi City serves as the headquarters of Tamilnad Mercantile Bank Limited, one of the leading private sector banks in India. Major educational establishments in the city include the Government Thoothukudi Medical College, Fisheries College and Research Institute, Tamil Nadu Maritime Academy, V.O. Chidambaram College, Kamaraj College, Anna University, and Government Polytechnic College. The V.O. Chidambaranar Port Authority is one of the major ports in India. Thoothukudi is an emerging energy and industrial hub of South India.

Coral reefs in India are one of the most ancient and dynamic ecosystems of India. The coral reefs not only provide a sanctuary to a myriad of marine life but also play a key role in protecting the coastline from erosion. India has about 7517 km of coastline including islands but mainland coast is 6100 km.