The calculated distance (air line) between Vaison-la-Romaine and Nîmes is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Nîmes is certainly longer, as only the direct route (as the crow flies) between Vaison-la-Romaine and Nîmes has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles