The calculated distance (air line) between Kampong Speu and Stung Treng is approximately 173 miles respectively 279 kilometers.
By car or train, the actual journey to Stung Treng is certainly longer, as only the direct route (as the crow flies) between Kampong Speu and Stung Treng has been calculated here.
Air line (approximately)
279 kilometers
151 nautical miles