© 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 Clerigos Glimpse - Porto Chapel in Crystal Palace Gardens - Porto Street between Ribeira and Sé in Porto River Douro View from Ribeira to Arrabida - Porto Clerigos Tower at Night - Porto Porto Rooves and Church