The island of Ko Mak is in the east of the Gulf of Thailand, 35 kilometers from the mainland, and is the third largest island in Trat Province, after Koh Chang and Koh Kut. With an area of 16 square kilometers, Ko Mak has 27 km of coastline, many long sandy beaches, and a few hills. The island is home to approximately 800 locals and renowned for its beautiful beaches, having been included in the UK's Sunday Times 10 most beautiful beaches list in 2006. Ko Mak has a temple, a primary school, three fishing villages, a market, and a health center. It is possible to walk to Ko Kham, a smaller island less than 1 km northwest of Ko Mak during low tide.