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The term Southeast Asia has been in use since World War II. The region has been further divided into two distinct sub-regions: Mainland Southeast Asia (or Indochina), which comprises the modern states of Vietnam, Laos, Cambodia, Thailand, Myanmar (Burma) and West Malaysia, and Maritime Southeast Asia (or Insular Southeast Asia), which comprises the modern states of Indonesia, East Malaysia, Singapore, Philippines, East Timor, Brunei, Cocos (Keeling) Islands, and Christmas Island.