The calculated distance (air line) between Smach Mean Chey and Kampong Chhnang is approximately 121 miles respectively 194 kilometers.
By car or train, the actual journey to Kampong Chhnang is certainly longer, as only the direct route (as the crow flies) between Smach Mean Chey and Kampong Chhnang has been calculated here.
Air line (approximately)
194 kilometers
105 nautical miles