title: Gulf of Tonkin
context: The Gulf of Tonkin (Vietnamese: Vịnh Bắc Bộ, Chinese:北部湾; also Chinese:东京湾) is a body of water located off the coast of northern Vietnam and southern China. It is a northern arm of the South China Sea. The Gulf is defined in the west by the northern coastline of Vietnam, in the north by China's Guangxi province, and to the east by China's Leizhou Peninsula and Hainan Island.
question: Where is the Gulf of Tonkin?
answers: off the coast of northern Vietnam and southern China