The calculated distance (air line) between Damietta and As Sinbillāwayn is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to As Sinbillāwayn is certainly longer, as only the direct route (as the crow flies) between Damietta and As Sinbillāwayn has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles