Tây Bắc (literally "Northwest") is one of the regions of Vietnam, located in the mountainous northwestern part of the country. It consists of four provinces: Điện Biên, Lai Châu, Sơn La, and Hòa Bình. The two provinces Lào Cai and Yên Bái are usually seen as part of the Northwest region. It has a population of about two and a half million.
Coordinates: 21°33′N 104°30′E / 21.550°N 104.500°E