Gulf of Tonkin

The Gulf of Tonkin is a northwestern arm of the South China Sea bordered by northern Vietnam and southern China. It forms a major maritime corridor and has been the setting for consequential territorial disputes and military events.

South China Sea: A marginal sea of the western Pacific Ocean bordered by Southeast Asian countries and southern China. The Gulf of Tonkin is a northwestern extension of this larger sea.
Gulf of Tonkin incident: A 1964 confrontation involving United States and North Vietnamese naval forces in the Gulf of Tonkin. The incident helped prompt major escalation of U.S. military involvement in Vietnam.
Haiphong: A major port city in northern Vietnam near the mouth of the Red River. Its port connects northern Vietnam’s commerce with the gulf.
Tonkin: A historical name for northern Vietnam, derived from the Vietnamese capital region around Hanoi. The gulf’s English name comes from this historical designation for northern Vietnam.
Hainan: A Chinese island province in the South China Sea, separated from mainland China by the Qiongzhou Strait. Hainan forms the gulf’s eastern boundary.
Gulf of Tonkin Resolution: A 1964 U.S. congressional resolution authorizing President Lyndon B. Johnson to use force in Southeast Asia. Congress passed it after reports of attacks in the gulf.
Beibu Gulf Economic Rim: A regional economic development area linking coastal parts of southern China and northern Vietnam around the Beibu Gulf. It frames cross-border transport and development around the gulf.
Cochinchina: A European historical name for parts of southern Vietnam, with boundaries that varied by period and usage. It contrasts with Tonkin, the historical regional name associated with the gulf.
Red River Delta: A fertile, densely populated region in northern Vietnam formed by sediment from the Red River and its tributaries. The delta opens onto the gulf and anchors Vietnam’s northern coast.
Tonkin campaign: A French military campaign against Vietnamese forces in northern Vietnam during 1883–1886. The campaign centered on control of the gulf’s northern Vietnamese coast.

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