Sri Lanka has stunning beaches around the coast surrounded by the Indian Ocean. Several Sri Lankan beaches show high biological diversity. Hikkaduwa, Pigeon Island, and Adam’s Bridge are the three marine protected ocean areas in Sri Lanka. More than hundreds of reef fishes and coral species authentic to these parks.

Hikkaduwa National Park is one of three marine national parks that lies on the southwest coast in the Southern Province of Sri Lanka. It contains a fringing coral reef in the park with a high degree of biodiversity. On 18th May 1979, the area was declared as a wildlife sanctuary.

Pigeon Island National Park, also known as Paravi Duwa National Park, is one of three marine national parks. It is bounded by the sea and is lies 1 km off the coast of Nilaveli in the Trincomalee district of the Indian Ocean. Pigeon Island was designated as a wildlife refuge in 1963. It was re-designated as a national park in 2003, and it is 471.43 ha in size.

Adam's Bridge Marine National Park is the third protected marine national park in Sri Lanka. In 2015, it was designated as a marine national park. It is biologically diverse and ecologically significant.