- The Gulf of Mannar Marine National Park is a located in the Gulf of Mannar, off the coast of Tamil Nadu in southern India.
- It is situated in Coromandel coast covering coasts of Thoothukudi, Tirunelveli, Rameswaram and Kanyakumari in Tamil Nadu.
- It includes a cluster of islands, coral reefs, and coastal areas.
- The park is home to endangered Dugongs (sea cow).
- In 1986, the Government of India declared a portion of the Gulf of Mannar as the Gulf of Mannar Marine National Park.
- In 1989, it was declared as a Marine Biosphere Reserve of India by the Government of India. Gulf of Mannar Marine National Park formed core area of Biosphere Reserve.
- In 2001, the Gulf of Mannar Marine National Park was designated as a Biosphere Reserve by UNESCO.
- In 2022, the Gulf of Mannar Biosphere Reserve was listed as a Ramsar site.
- Area: Park covers an area of approximately 560 square kilometers (216 square miles).
- River: The park is fed by several rivers including:
- Vaigai River
- Pambar River
- Chittar River
- Vaippar River
- Manimuthar River
- Thamirabarani River
- Flora: Mangroves (Rhizophora apiculata, Avicennia marina, Ceriops decandra, and Excoecaria agallocha), Coral Reefs, Seagrasses (Halophila ovalis, Halodule uninervis, and Cymodocea serrulata), Algae and Seaweeds (filamentous algae, red algae, brown algae, and green algae) etc.
- Fauna: Marine Mammals (Dugong (Sea Cow), Indo-Pacific bottlenose dolphin, spinner dolphin and humpback dolphin), Birds (egrets, herons, terns, gulls, plovers, sandpipers), Sea Turtles (Olive Ridley turtle, Green turtle, Hawksbill turtle, and Loggerhead turtle), Crustaceans (crabs, lobsters, shrimps, and prawns) etc.