The calculated distance (air line) between Ar Rumaythīyah and Shādegān is approximately 99 miles respectively 159 kilometers.
By car or train, the actual journey to Shādegān is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythīyah and Shādegān has been calculated here.
Air line (approximately)
159 kilometers
86 nautical miles