What is the name of the Gulf separating the coast of northern Vietnam from China and into which the Red River flows?
Tonkin Tongking Đàng Ngoài Tong-king Chiao-chih Tongkin Tunquin Bac Ky Ton-kin Dongking Bác Bô Tonking
tong king bac ky tonkin tunquin tongkin ton kin đàng ngoài bác bô tonking chiao chih dongking tongking
tonkin
WikipediaEntity
Tonkin