The calculated distance (air line) between Bor and Sremska Mitrovica is approximately 137 miles respectively 221 kilometers.
By car or train, the actual journey to Sremska Mitrovica is certainly longer, as only the direct route (as the crow flies) between Bor and Sremska Mitrovica has been calculated here.
Air line (approximately)
221 kilometers
119 nautical miles