Stretching between Rameswaram and Thoothukudi, this park protects a chain of 21 uninhabited islands and shallow reefs India’s first marine biosphere reserve. Coral gardens, extensive seagrass meadows, mangroves, and sandbars support dugongs, dolphins, sea turtles, sea cucumbers, and rich reef fish making it a flagship site for marine conservation, field study, and low-impact eco-exploreism.

Along Tamil Nadu’s southeast coast, access is via Rameswaram/Mandapam and Thoothukudi with Forest Department–authorized boat trips (seasonal, weather-dependent); landings on most core islands are restricted observe no-touch/no-collect rules, wear life jackets, and use reef-safe sunscreen. Best seas are typically Nov–Mar. Pair your visit with Rameswaram Temple & Dhanushkodi (Ramanathapuram side) or Thoothukudi shoreline & islands a science-rich, photographer-friendly marine escape.