The calculated distance (air line) between Ar Riyāḑ and Al Maḩallah al Kubrá is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Al Maḩallah al Kubrá is certainly longer, as only the direct route (as the crow flies) between Ar Riyāḑ and Al Maḩallah al Kubrá has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles