The calculated distance (air line) between Lvea Leu and Smach Mean Chey is approximately 162 miles respectively 260 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 Lvea Leu and Smach Mean Chey has been calculated here.
Air line (approximately)
260 kilometers
140 nautical miles