Son La belongs to North-West Vietnam, shares border with Yen Bai, Lao Cai, Lai Chau provinces on the north, Dien Bien Province on the west, Phu Tho and Hoa Binh provinces on the east and Laos on the south.
The province has many mountains, rives and mineral sources. Abundant water supply is suitable to hydroelectricity. Moc Chau Plateau is an ideal place to breed milk cow, plant tea and fruit. Annual average temperature is about 21ºC. The weather is cold, dry in winter and hot in summer.