The calculated distance (air line) between Cẩm Phả Mines and Cao Bằng is approximately 132 miles respectively 213 kilometers.
By car or train, the actual journey to Cao Bằng is certainly longer, as only the direct route (as the crow flies) between Cẩm Phả Mines and Cao Bằng has been calculated here.
Air line (approximately)
213 kilometers
115 nautical miles