Tonkin
geographical name
Ton·kin ˈtäŋ-kən 
ˈtän-ˈkin,
ˈtäŋ-
variants or Tongking
ˈtäŋ-ˈkiŋ
region of northern Indochina bordering on China; chief city Hanoi
Note: Since 1946 Tonkin has been the northern part of Vietnam.
Tonkinese
ˌtäŋ-kə-ˈnēz
adjective or noun ˌtän-
-ˈnēs
or Tongkingese
ˌtäŋ-kiŋ-ˈēz
-ˈēs