Ngưu Hống

Ngưu Hống (Vietnamese, lit. Cobra) or Heishui (Chinese, lit. Black River) were names for a medieval Black Tai polity that located in northwest Vietnam, mainly around the Black River. Its territory comprises modern-day provinces of Điện Biên, Lai Châu, Sơn La as well as western parts of Lào Cai and Yên Bái.

Ngưu Hống

Ngưu Hống (Vietnamese, lit. Cobra) or Heishui (Chinese, lit. Black River) were names for a medieval Black Tai polity that located in northwest Vietnam, mainly around the Black River. Its territory comprises modern-day provinces of Điện Biên, Lai Châu, Sơn La as well as western parts of Lào Cai and Yên Bái.