Ko Man Nai

Ko Man Nai is the largest of the Mu Ko Man islands off Laem Mae Phim in Klaeng District, Rayong Province, eastern Thailand. Located about 10 km offshore in the Gulf of Thailand, it is best known for the Sea Turtle Conservation Centre operated by the Department of Marine and Coastal Resources. The small, forested island features clear waters, coral reefs and beaches, and serves as a protected breeding and rehabilitation site for endangered sea turtles.

Visitors reach Ko Man Nai by chartered boat from Laem Mae Phim Pier for a day trip. The island is small, quiet and largely natural with sandy beaches, clear shallow water, coral areas and low forest. The main focus is the Sea Turtle Conservation Centre with rearing ponds, exhibition tanks and information displays about green and hawksbill turtles. Visitors can walk along beaches, view turtles at different growth stages, snorkel in designated areas and enjoy coastal scenery with no large-scale tourist development.

Ko Man Nai has housed a sea turtle conservation and breeding station since 1979, originally established by the Department of Fisheries and now managed by the Department of Marine and Coastal Resources to protect endangered green and hawksbill turtles, incubate eggs, rear juveniles and release them into the Gulf of Thailand.

The island serves as an educational and conservation site promoting marine environmental awareness and sea turtle protection in Rayong Province, visited by students, researchers and tourists for learning about marine ecology.