The calculated distance (air line) between Ar Rābiyah and Umm Qaşr is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Umm Qaşr is certainly longer, as only the direct route (as the crow flies) between Ar Rābiyah and Umm Qaşr has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles