• Ko Samet is one of the Eastern Seaboard Islands of Thailand. It is in the Gulf of Thailand off the coastline of the Thai province of Rayong, approximately 220kilometres southeast of Bangkok. Ko Samet is part of the Phe Subdistrict of the Amphoe Mueang Rayong , of Rayong Province. Ko Samet is the largest and westernmost of a cluster of islands not far from the coast. Ko Samet the length 6.5 kilometres south of mainland Rayong Province.
• Popular with foreign tourists and as a weekend getaway for residents of nearby Bangkok, most of the island is in the Khao Laem Ya–Mu Ko Samet National Park. In 1981, the Royal Forest Department declared the archipelago of Samet, along with nine other small islands, the headland of Khao Laem Ya, and the 11 kilometres Mae Ramphueng Beach to be a national park, and thus Ko Samet is under the protection of the National Parks Division of the Thai government.