Gulf of Tonkin
body of water located off the coast of northern Vietnam and southern China, northern arm of the South China Sea
en-US/ˈɡʌlf ʌv ˈtɑnˈkɪn/
en-GB/ˈɡʌlf əv tʌnkɪn/
body of water located off the coast of northern Vietnam and southern China, northern arm of the South China Sea