The Gulf of Mannar is a huge shallow bay in the Indian Ocean that is part of the Laccadive Sea. It has an average depth of 5.8 meters. The Coromandel Coast region is located between the southeastern tip of India and the west coast of Sri Lanka. Ram Sethu (aka Adam’s Bridge), a chain of low islands and reefs that includes Mannar Island, separates the Gulf of Mannar from Palk Bay, which lies to the north between India and Sri Lanka. The estuaries of South India’s Thamirabarani and Vaippar rivers, as well as Sri Lanka’s Malvathu Oya (Malvathu River), drain into the Gulf. The dugong (sea cow) can be found here.