© 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/phbcz Related images Cnetral Porto Buildings Houses in the Ribeira - Porto River Douro View from Ribeira to Arrabida - Porto Monument to the Heroes of the Peninsula War - Porto Igreja de São Ildefonso - Porto Rua de 31 de Janeiro - Porto