The first marine sanctuary in India, having within its bound's coral reefs, Mollusca, dolphins, tortoises and various kinds of sea birds, has been established in

1. The question asks to identify the location of India's first marine sanctuary, known for specific biodiversity features like coral reefs, Mollusca, dolphins, tortoises, and sea birds. 2. The Marine National Park and Sanctuary in the Gulf of Kachchh, Gujarat, was established starting in 1980 (sanctuary) and 1982 (national park). It was India's first marine national park/sanctuary. 3. This sanctuary is well-known for its rich marine biodiversity, including extensive coral reefs (patchy), diverse Mollusca, marine mammals like dolphins, marine reptiles like tortoises (sea turtles), and numerous species of coastal and sea birds. 4. Sundarbans is famous for mangroves and tigers (a Biosphere Reserve, National Park, Tiger Reserve). 5. Chilka Lake is a brackish water lagoon, famous for migratory birds and Irrawaddy dolphins, designated as a Ramsar site. 6. Lakshadweep islands have rich coral reefs and associated biodiversity but the first dedicated marine sanctuary was established in the Gulf of Kachchh.