The calculated distance (air line) between Haong Samnam and Smach Mean Chey is approximately 81 miles respectively 131 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 Haong Samnam and Smach Mean Chey has been calculated here.
Air line (approximately)
131 kilometers
70 nautical miles