It flows through Lang Son Province and is a tributary of the Bắc Giang River and the Bắc Khê River.
Tributaries include the Bắc Giang River and the Bắc Khê River. It flows through Lang Son Province.
It flows through Lang Son Province. Tributaries include the Bắc Giang River and the Bắc Khê River.
It flows through Lang Son Province. Tributaries include the Bắc Giang River and the Bắc Khê River.