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Pigeon Island National Park is one of the two marine national parks of Sri Lanka. The national park is situated 1 km off the coast of Nilaveli, a coastal town in Eastern Province, encompassing a total area of 471.429 hectares. The island's name derives from the rock pigeon which has colonized it. The national park contains some of the best remaining coral reefs of Sri Lanka. Pigeon Island was designated as a sanctuary in 1963. In 2003 it was redesignated as a national park. This national park is the 17th in Sri Lanka. The island was used as a shooting range during the colonial era.

Pigeon Island consists of two islands; large pigeon island and small pigeon island. The large pigeon island is fringed by a coral reef, and is about 200 m long and 100 m wide. Its highest point is 44.8 m above mean sea level. The small pigeon island is surrounded by rocky islets. The national park is situated within the dry zone of Sri Lanka.

Many of the 100 species of corals and 300 coral reef fishes recorded around the Trincomalee area are found in the national park. Juvenile and adult blacktip reef shark are seen around the shallow coral areas. Hawksbill turtle, green turtle and olive ridley are the visiting sea turtles of the coral reef. The island is important breeding ground for the rock pigeon.