The calculated distance (air line) between Sihanoukville and Cao Lãnh is approximately 143 miles respectively 231 kilometers.
By car or train, the actual journey to Cao Lãnh is certainly longer, as only the direct route (as the crow flies) between Sihanoukville and Cao Lãnh has been calculated here.
Air line (approximately)
231 kilometers
124 nautical miles