The calculated distance (air line) between Paoy Paet and Smach Mean Chey is approximately 149 miles respectively 240 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 Paoy Paet and Smach Mean Chey has been calculated here.
Air line (approximately)
240 kilometers
130 nautical miles