Area: 6,886.3 sq. km.
Population: 792.7 thousand habitants (2015).
Capital: Yen Bai City.
Administrative divisions:
- Town: Nghia Lo.
- Districts (7): Luc Yen, Van Yen, Mu Cang Chai, Tran Yen, Yen Binh, Van Chan, Tram Tau.
Ethnic groups: Viet (Kinh), Tay, Dao, H'Mong...