Ko Samet (Cajeput Island; , ) 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 southeast of Bangkok. Ko Samet is part of the Phe () Subdistrict of the Amphoe Mueang Rayong (, the capital district, or Amphoe Mueang), of Rayong Province. Ko Samet is the largest and westernmost of a cluster of islands not far from the coast. Ko Samet measures from north to south. At its closest point to the mainland, the island is south of mainland Rayong Province; however the actual travelling distance from the main commercial tourist pier in the town of Phe to the island's closest tourist beach is about . Popular with foreign tourists and as a weekend getaway for residents of nearby Bangkok, most of the island (excluding the Na Dan area) 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 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. History The Thai government restricted overnight stay on the island until 1981 (even though Bangkokians had known of the beauty of Ko Samet for decades). In that year, on 1 October, the Forestry Department of Thailand declared Ko Samet and environs to be a national park. Geography and climate Located 220 km from the capital in the Gulf of Thailand, Ko Samet is approximately in size, and shaped somewhat like the letter "t". Along the length of the "t" (north-south) the island measures approximately 7 km, and measures 4 km across the "t" (west-east). Forests blanket up to 80 percent of the total area. Closest to the mainland, lies the small island port village of Na Dan, commonly known as Ko Samet Village, with its nearby beach, Hat Sai Kaeo (Glass Sand Beach; ), the longest beach on Ko Samet. Most of Ko Samet's beaches lie along the eastern shore of the island. Other beaches on the island include: Ao Phai, Ao Wai, Ao Kio Na Nai, Ao Cho, Ao Kio Na Nok, Ao Wong Duean, Cape Kut, Ao Toei, and Ao Karang at the southern tip, and Ao Phrao on the western shore