The calculated distance (air line) between El Achir and Aïn Oussera is approximately 105 miles respectively 170 kilometers.
By car or train, the actual journey to Aïn Oussera is certainly longer, as only the direct route (as the crow flies) between El Achir and Aïn Oussera has been calculated here.
Air line (approximately)
170 kilometers
92 nautical miles