wide open marshland of authie bay near berck, france, in autumn, showcasing a serene natural landscape with sandy paths, grassy

marshland baie bay authie berck france autumn october nature landscape dunes grass sandy paths overcast coastal serene fortmahon somme hautsdefrance marquenterre picardy northern europe sea mud slikke schorre salt marsh peaceful wetland wilderness open field flat terrain greenery vegetation habitat meadow natural reserve biodiversity wild untouched horizon sky cloudy calm tranquility environment