It originates in the Guangxi, China, flows in the northwest-southeast to Cao Bằng through Sóc Giang border gate, Sóc Hà rural commune, Hà Quảng District.

The river flowing through Cao Bằng ends at Tà Lùng border gate, Mỹ Hưng rural commune, Phục Hòa District (at the southeast of Cao Bằng Province) before it returns to Guangxi, China.

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