The calculated distance (air line) between Póvoa de Santa Iria and Ermesinde is approximately 165 miles respectively 266 kilometers.
By car or train, the actual journey to Ermesinde is certainly longer, as only the direct route (as the crow flies) between Póvoa de Santa Iria and Ermesinde has been calculated here.
Air line (approximately)
266 kilometers
143 nautical miles