The calculated distance (air line) between Saint-Maximin-la-Sainte-Baume and Gardanne is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Gardanne is certainly longer, as only the direct route (as the crow flies) between Saint-Maximin-la-Sainte-Baume and Gardanne has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles