The calculated distance (air line) between Smach Mean Chey and Paoy Paet is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Paoy Paet is certainly longer, as only the direct route (as the crow flies) between Smach Mean Chey and Paoy Paet has been calculated here.
Air line (approximately)
240 kilometers
130 nautical miles