The calculated distance (air line) between Krong Kep and Smach Mean Chey is approximately 114 miles respectively 183 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 Krong Kep and Smach Mean Chey has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles