autumn cloud coast coastline fall fjord HDR hill horizon island Nyberg power powerline powerlines pylone pylones sea shore sky sun sunlight water Athabasca boulder canada current deluge drop falls fierce flow landscape natural nature plunge pour river rock Rockies Rocky Mountains torrent turmoil waterfall Banff bank Bow Falls channel conifers danger dangerous foam rage rapids rocks trees violent cascade cascades cold falling fresh high impressive kjosfossen loud mighty mountain mountains norway norwegian powerful strong wet wild beautiful beauty color colour England english Great Britain lake leisure national trust park pleasure Sheffield Park Sussex tourists architecture decorative elements feature fountain London ornamental pool Regent's Park stone urn walk aerate aeration background buttresses cascading dam Elan Valley hold landmark old reservoir retain texture wales wall welsh amber exercise footpath leaves orange outdoors parkland path Surrey trail tree yellow