Noun | 1. | ![]() ASEAN, Association of Southeast Asian Nations - an association of nations dedicated to economic and political cooperation in southeastern Asia and who joined with the United States to fight against global terrorism Indochina, Indochinese peninsula - a peninsula of southeastern Asia that includes Myanmar and Cambodia and Laos and Malaysia and Thailand and Vietnam Mekong, Mekong River - an Asian river; flows through a large delta in southern Vietnam into the South China Sea |