Cầu River is a river of northern Vietnam. It flows through the provinces/cities of Bắc Kạn, Thái Nguyên, Bắc Giang, Hanoi, Bắc Ninh. It begins at the Phia Bioóc Peak in Chợ Đồn District, west of mount

Thái Nguyên is a province in the Northeast region of Vietnam. It is a mountainous inland province. Thái Nguyên's society is composed of eight ethnic groups.