The calculated distance (air line) between Umm as Sāhik and Al Qaţīf is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Al Qaţīf is certainly longer, as only the direct route (as the crow flies) between Umm as Sāhik and Al Qaţīf has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles