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
chiao chih tonking bác bô tong king tongking tunquin bac ky tonkin dongking ton kin tongkin đàng ngoài
tonkin
WikipediaEntity
Tonkin