The calculated distance (air line) between Ḩalwān and Al Wāsiţah is approximately 35 miles respectively 57 kilometers.
By car or train, the actual journey to Al Wāsiţah is certainly longer, as only the direct route (as the crow flies) between Ḩalwān and Al Wāsiţah has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles