A red and white tourist boat, identified by the text "living tours" on its side, navigates the Douro River in Porto, Portugal

A red and white tourist boat, identified by the text "living tours" on its side, navigates the Douro River in Porto, Portugal. The vessel, a small passenger boat featuring a white cabin with multiple windows and an open upper deck, is in motion, creating a white wake behind its stern as it moves from the mid-right towards the upper-left of the frame. The river surface exhibits widespread ripples and small waves across the entire field of view, appearing dark grey-blue. No individuals or other specific objects are discernible.