The calculated distance (air line) between Thái Nguyên and Móng Cái is approximately 136 miles respectively 219 kilometers.
By car or train, the actual journey to Móng Cái is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Móng Cái has been calculated here.
Air line (approximately)
219 kilometers
118 nautical miles