The calculated distance (air line) between Saint-Julien-en-Genevois and Nîmes is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Nîmes is certainly longer, as only the direct route (as the crow flies) between Saint-Julien-en-Genevois and Nîmes has been calculated here.
Air line (approximately)
290 kilometers
157 nautical miles