The calculated distance (air line) between Nîmes and Le Grau-du-Roi is approximately 23 miles respectively 38 kilometers.
By car or train, the actual journey to Le Grau-du-Roi is certainly longer, as only the direct route (as the crow flies) between Nîmes and Le Grau-du-Roi has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles