PLANETOBSERVER / SCIENCE PHOTO LIBRARY PLANETOBSERVER / SCIENCE PHOTO LIBRARY
French coastline. True-colour satellite image of the Atlantic coastline of south-west France. North is at top. Vegetation is green and water is blue. A sandy beach (white) stretches up the coast. Over time the sand has moved northwards by longshore drift to form a bar that has cut off two saltwater lagoons (upper centre) from the Atlantic Ocean. A sand bar that is permanently exposed above sea level is known as a barrier-beach. At top right is the city of Bordeaux (grey/pale blue). Another bar is partially blocking the entrance to Arcachon Bay (Bassin d'Arcachon, upper centre).
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