The calculated distance (air line) between Póvoa de Varzim and Rio Tinto is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Rio Tinto is certainly longer, as only the direct route (as the crow flies) between Póvoa de Varzim and Rio Tinto has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles