The calculated distance (air line) between Al Ḩayy and Nāḩiyat al Fuhūd is approximately 92 miles respectively 149 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 Al Ḩayy and Nāḩiyat al Fuhūd has been calculated here.
Air line (approximately)
149 kilometers
80 nautical miles