Ko Mak (Things to do - Places to Visit) - KO MAK Top Tourist Placesbr Island in Thailandbr Ko Mak is a small island of Trat Province, Thailand. The island is named after the Areca nut. br br 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 Ko Chang and Ko Kut. With an area of 16 square kilometers, Ko Mak has 27 km of coastline, many long sandy beaches, and a few hills.