The calculated distance (air line) between Al Maḩmūdīyah and Ḩalwān is approximately 104 miles respectively 167 kilometers.
By car or train, the actual journey to Ḩalwān is certainly longer, as only the direct route (as the crow flies) between Al Maḩmūdīyah and Ḩalwān has been calculated here.
Air line (approximately)
167 kilometers
90 nautical miles