Area: 14,174,4 sq. km.
Population: 1,007.5 thousand habitants (2006)
Capital: Son La City.
Districts: Quynh Nhai, Muong La, Thuan Chau, Phu Yen, Bac Yen, Mai Son, Song Ma, Yen Chau, Moc Chau, Sop Cop.
Ethnic groups: Dao, Thai, Viet (Kinh), H'Mong, Muong.