a vast and tranquil view of the baie d'authie at low tide, with a solitary white bird wading in shallow tidal pools, distant

coastal beach shoreline tidal sand sea ocean water reflection wetland nature wildlife solitude peaceful blue sky berck fortmahon somme bay authie hautsdefrance marquenterre picardy northern france europe mud slikke schorre salt marsh english channel horizon low tide receding lagoon estuary habitat ecosystem environment marine aquatic wilderness isolated seascape waves ripples clouds atmospheric exploration