The calculated distance (air line) between Joal-Fadiout and Diourbel is approximately 52 miles respectively 83 kilometers.
By car or train, the actual journey to Diourbel is certainly longer, as only the direct route (as the crow flies) between Joal-Fadiout and Diourbel has been calculated here.
Air line (approximately)
83 kilometers
45 nautical miles