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