The calculated distance (air line) between Ar Rifā‘ and Al Muharraq is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Al Muharraq is certainly longer, as only the direct route (as the crow flies) between Ar Rifā‘ and Al Muharraq has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles