The calculated distance (air line) between Damietta and Birkat as Sab‘ is approximately 70 miles respectively 112 kilometers.
By car or train, the actual journey to Birkat as Sab‘ is certainly longer, as only the direct route (as the crow flies) between Damietta and Birkat as Sab‘ has been calculated here.
Air line (approximately)
112 kilometers
60 nautical miles