The calculated distance (air line) between Salaberry-de-Valleyfield and Nepean is approximately 78 miles respectively 125 kilometers.
By car or train, the actual journey to Nepean is certainly longer, as only the direct route (as the crow flies) between Salaberry-de-Valleyfield and Nepean has been calculated here.
Air line (approximately)
125 kilometers
67 nautical miles