© 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 Monument to the Heroes of the Peninsula War - Porto Praca da Ribeira - Porto Rua Santa Catarina - Porto River Douro, Early Morning - Porto Arrábida Bridge glimpse from Crystal Palace - Porto Art Nouveau in Porto