The calculated distance (air line) between Diyarb Najm and Hihyā is approximately 10 miles respectively 17 kilometers.
By car or train, the actual journey to Hihyā is certainly longer, as only the direct route (as the crow flies) between Diyarb Najm and Hihyā has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles