wadden sea sand d by wind and tidal currents

area background bio coast coastal coastline conservation currents europa europe flat flats frame full game german germany image low mudflat mudflats national nationalpark nature norddeutschland nordsee north northern park pattern patterned protected reserve ripple sand sandboden sandboeden sandbapara den sandy schleswigholstein sea shaped soil structure surface textured tidal tide tideland undulating wadden wattenmeer wavy westerhever wind