The calculated distance (air line) between Sima and Adda-Douéni is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Adda-Douéni is certainly longer, as only the direct route (as the crow flies) between Sima and Adda-Douéni has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles