The calculated distance (air line) between Munsha‘at Abū ‘Umar and Arīsh is approximately 106 miles respectively 171 kilometers.
By car or train, the actual journey to Arīsh is certainly longer, as only the direct route (as the crow flies) between Munsha‘at Abū ‘Umar and Arīsh has been calculated here.
Air line (approximately)
171 kilometers
92 nautical miles