The calculated distance (air line) between Sidi Bel Abbes and En Nedjma is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to En Nedjma is certainly longer, as only the direct route (as the crow flies) between Sidi Bel Abbes and En Nedjma has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles