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 (tŏn′kĭn′, tŏng′-)
A historical region of southeast Asia on the Gulf of Tonkin, an arm of the South China Sea, now forming most of northern Vietnam. It was part of French Indochina from 1887 to 1946.

Ton′kin·ese′ (-ēz′, -ēs′) adj. & n.


(ˈtɒnˈkɪn) or


1. (Placename) a former state of N French Indochina (1883–1946), on the Gulf of Tonkin: forms the largest part of N Vietnam
2. (Placename) Gulf of Tonkin an arm of the South China Sea, bordered by N Vietnam, the Leizhou Peninsula of SW China, and Hainan Island. Length: about 500 km (300 miles)


(ˈtɒnˈkɪn, ˈtɒŋ-)

also Tongking

1. a former state in N French Indochina, now part of Vietnam.
2. Gulf of, an arm of the South China Sea, W of Hainan. 300 mi. (485 km) long.
References in periodicals archive ?
The book also validates what many scholars have surmised from earlier evidence: that a politically sophisticated society, founded by an aristocratic elite, was already in place in what we today call the Bac Bo area well before its incorporation as one of the southernmost territories under the control of the Han Dynasty.
Ha Long Bay is a part of Bac Bo Gulf and comprises the sea area of Ha Long city, Cam Pha city and a part of Van Don island district, Quang Ninh province.
On that day, navy ships from the People's Republic of China shot and killed nine Vietnamese fishermen and injured seven others in the Vinh Bac Bo (Gulf of Tonkin).