The calculated distance (air line) between Munsha‘at Abū ‘Umar and Damietta is approximately 37 miles respectively 60 kilometers.
By car or train, the actual journey to Damietta is certainly longer, as only the direct route (as the crow flies) between Munsha‘at Abū ‘Umar and Damietta has been calculated here.
Air line (approximately)
60 kilometers
32 nautical miles