The calculated distance (air line) between Phumĭ Khchau and Smach Mean Chey is approximately 144 miles respectively 232 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 Phumĭ Khchau and Smach Mean Chey has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles