The calculated distance (air line) between Saint-Martin-de-Crau and Nîmes is approximately 26 miles respectively 43 kilometers.
By car or train, the actual journey to Nîmes is certainly longer, as only the direct route (as the crow flies) between Saint-Martin-de-Crau and Nîmes has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles