A subregion of Asia that consists of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies near the intersection of geological plates, and has heavy seismic and volcanic activity. Southeast Asia consists of two geographic regions: Maritime Southeast Asia, which includes Brunei, Christmas Island, East Malaysia, East Timor, Indonesia, Philippines and Singapore; and Mainland Southeast Asia, also known as Indochina, which includes Cambodia, Laos, Myanmar (Burma), Thailand, Vietnam, and West Malaysia.
