The calculated distance (air line) between Nahiyat Ghammas and Al Ḩayy is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Al Ḩayy is certainly longer, as only the direct route (as the crow flies) between Nahiyat Ghammas and Al Ḩayy has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles