old bridge in san rafael on the odiel river, the eighteenth century, at the entrance of sotiel, huelva, spain

acid acidic andalusia aracena big bridge calaaaplusmn calanas channel colorful colors contamination death deep foam historical huelva ibericos industry landscape metal mineral motion nature odiel old pigments pollution pyrites quiet rafael rain reflection rio river road rock route saturation sierra solitary sotiel spain stone sulfur tinto vacation walkway water wave way yellow