The calculated distance (air line) between Kampong Speu and Smach Mean Chey is approximately 101 miles respectively 162 kilometers.
By car or train, the actual journey to Smach Mean Chey is certainly longer, as only the direct route (as the crow flies) between Kampong Speu and Smach Mean Chey has been calculated here.
Air line (approximately)
162 kilometers
88 nautical miles