The
Red River (Chinese:
t ,
s ,
p ; ), also known as the and (
lit. "Mother River") in Vietnamese and the (, ) in Chinese, is a river that flows from
Yunnan in
southwest China through northern
Vietnam to the
Gulf of Tonkin. According to C. Michael Hogan, the associated
Red River Fault was instrumental in forming the entire
South China Sea at least as early as 37 million years before present.