The calculated distance (air line) between Ninh Bình and Thái Nguyên is approximately 93 miles respectively 149 kilometers.
By car or train, the actual journey to Thái Nguyên is certainly longer, as only the direct route (as the crow flies) between Ninh Bình and Thái Nguyên has been calculated here.
Air line (approximately)
149 kilometers
81 nautical miles