The island of Ko Mak is situated in the East of the Gulf of Thailand, 35 kilometers from the mainland, and is the third largest island in Trat Province, after Ko Chang and Koh Kood. With an area of 16 square kilometers Ko Mak has 27 km of coastline, many long sandy beaches, and a few hills. Having been included in the U.K's Sunday Times 10 most beautiful beaches list in 2006.