bog land ecology landscape river stream water wetland floating green HDR quite romance silence summer appearance cascading colors colours cool cooling darkness edge edges edging light peace peaceful pouring reflecting ripples rippling rocks rocky running shade shadows small stones streaming sunlight sunshine waterfall wet desert grassland pool rock savannah springs trickle forest mountain mountains relax tree trees walk background bush bushland country creek dark flow flowing grass gravel grounds moving reflections rural steady textures uncultivated lively nature pebbles fall fast leaves twigs artificial brook burn drain drainage manmade Denmark natural spring wood woodland