Koh Samui - the eponymous town located on the island of Koh Samui. Samui island in the Gulf of Thailand Pacific ocean. Is part of the Thai province of Surat Thani. The second largest island of Thailand after Phuket, with an area 228,7 km2 max height above sea level to 635 m. the Popular resort. The population of the island Koh Samui - 62 thousand people.