A group of 24 islands south of Koh Chang was designated as the Koh Kood sub-district in 1990.. These include the main island of Koh Kood, 9 islands of Koh Mak and 12 islands of Koh Rang. Koh Kood Sub-district has a very small population of less than 2,000. About 70% of the population are on Koh Kood while the rest live on Koh Mak. Almost all other islands are uninhabited. Fishing and agriculture are the main occupations

Situated 80 kms southeast of the provincial capital of Trat, Koh Kood is the farthest island from the mainland. It is also the easternmost island of Thailand bordering Kampuchea. With an area of 129 sq. kms Koh Kood is the second largest island of the Koh Chang Marine National Park and fourth largest in Thailand, after Koh Samui. It is supported by essential infrastructure, which include a hospital, schools, police station, electricity (mainly for state-run facilities), water and telephone system. Fuel and solar energy are, the main sources of electricity here. Most resorts generate their own electricity.