The calculated distance (air line) between Gémenos and Aix-en-Provence is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Aix-en-Provence is certainly longer, as only the direct route (as the crow flies) between Gémenos and Aix-en-Provence has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles