North Vietnam was a state in a region.
Southeast Asia or Southeastern Asia is a subregion of Asia , consisting of the countries that are geographically south of China , east of India , west of New Guinea and north of Australia .. subregion. subregion. Asia. Asia. China. China. India. India. New Guinea. New Guinea. Australia. Australia. The region lies near the intersection of geological plates , with heavy seismic and volcanic activity .. geological plates. plate tectonics. Southeast Asia consists of two geographic regions  :. Asia. Asia. Mainland Southeast Asia , also known historically as Indochina , comprising Vietnam , Laos , Cambodia , Thailand , Myanmar -LRB- Burma -RRB- , and -LRB- West -RRB- Malaysia .. Asia. Asia. Mainland Southeast Asia. Mainland Southeast Asia. Indochina. Indochina. Vietnam. Vietnam. Laos. Laos. Cambodia. Cambodia. Thailand. Thailand. Malaysia. Malaysia. Maritime Southeast Asia , also known historically as the East Indies comprising Indonesia , -LRB- East -RRB- Malaysia , Singapore , Philippines , East Timor , Brunei , Christmas Island , Andaman and Nicobar Islands , and Cocos -LRB- Keeling -RRB- Islands .. Singapore. Singapore. Asia. Asia. Maritime Southeast Asia. Maritime Southeast Asia. East Indies. East Indies. Indonesia. Indonesia. Malaysia. Malaysia. Philippines. Philippines. East Timor. East Timor. Brunei. Brunei. Christmas Island. Christmas Island. Andaman and Nicobar Islands. Andaman and Nicobar Islands