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