太原省
Lạng Sơn () is a province in northern Vietnam, bordering Guangxi province in China. Its capital is also called Lạng Sơn, which is a strategically important town at the border with China and is northeast of Hanoi connected by rail and road. Lạng Sơn Province is bordered by China, Cao Bằng Province, Bắc Giang Province, Bắc Kạn Province, Quảng Ninh Province and Thái Nguyên Province. The province covers an area of 8310.09 square kilometres and as of 2008 it had a population of 781,655.