bank cane meadow nature plants river shore stream trees water fierce flow foam granite gush hard norway powerful rock rush spate spring stone strong abstract colombia cooling fresh rapids rocky rolling rapids algae background brackish bush bushland colors colours cool country creek crowded dark flowing foliage grass grasses green greenery grounds light moving peaceful reeds reflecting reflections ripples rippling running rural rushes shade shadows slow sluggish stones streaming sunlight sunshine textures tranquil uncultivated vegetation wet Asia fall forest jungle Malaysia rain rocks selangor ulu waterfall yam ecology landscape summer wales wood autumn fishstaircase leaf Nyberg cascade formal garden lake pond steps Victorian