The calculated distance (air line) between Svay Rieng and Stung Treng is approximately 169 miles respectively 272 kilometers.
By car or train, the actual journey to Stung Treng is certainly longer, as only the direct route (as the crow flies) between Svay Rieng and Stung Treng has been calculated here.
Air line (approximately)
272 kilometers
147 nautical miles