The calculated distance (air line) between Thái Nguyên and Hải Dương is approximately 55 miles respectively 88 kilometers.
By car or train, the actual journey to Hải Dương is certainly longer, as only the direct route (as the crow flies) between Thái Nguyên and Hải Dương has been calculated here.
Air line (approximately)
88 kilometers
48 nautical miles