Ferry bringing tourists who are enjoying the moment on the Douro River on a cloudy day, in calm and tranquil waters

ferry bringing tourists enjoying moment douro river cloudy day calm tranquil waters riverboat tourist boat cloudy weather overcast river tourism tourist attraction water transport scenic landscape sightseeing cloudy day scenic river tourist experience enjoyment tranquil waters calm river douro region waterway vacation douro valley passenger boat tourist ride scenic beauty cloudy conditions water voyage douro scenery calm waters sky