The calculated distance (air line) between Salwá and Nāḩiyat al Fuhūd is approximately 141 miles respectively 227 kilometers.
By car or train, the actual journey to Nāḩiyat al Fuhūd is certainly longer, as only the direct route (as the crow flies) between Salwá and Nāḩiyat al Fuhūd has been calculated here.
Air line (approximately)
227 kilometers
123 nautical miles