Arun chalk cliff current England english field flow Great Britain green landscape meadow natural nature peaceful placid river rural summer Sussex trees water banks Bedfordshire bridge course fresh great Ouse oxygenate oxygenation reflections waterweed weir bank blue countryside gentle sky spring tranquil tree woodland backdrop background balance blurred brook cascade copy copyspace country environment fall falling flora flowing gold harmony HDR motion pure purity rain rapid rock season seasonal space spate speed splash splashing stone stream waterfall white yellow zen full algae brackish bush bushland colors colours cool creek crowded dark foliage grass grasses greenery grounds light moving plants reeds reflecting ripples rippling running rushes shade shadows slow sluggish stones streaming sunlight sunshine textures uncultivated vegetation wet architecture autumn decorative elements feature fountain leisure London ornamental park pool Regent's Park urn walk North Yorkshire quiet River Ure Yorkshire Dales National Park fierce foam norway norwegian outflow pour power raging rocks spray torrent torrential Tvindefosse violent bend bird pair peace ripple riverbank smooth swan swim tranquility clean fence home house meander posts quality road street village