© All Rights Reserved A cruise ship on the River Douro near Peso da Regua. There are many such trips leaving Porto ranging in a few hours duration to a few days. ©Can Stock Photo Inc/phbczRelated images Porto Riverside Avenida de Dom Carlos I - Foz - Porto Ornate Shop Doorway - Porto Praca da Ribeira - Porto Looking across Ponte D. Luís to Ribeira at Night Porto Shopfront