watts wadden sea sand watt hike mudflat hiking hike in the wadden islands watt trails intertidal zone coast the coastal area low tide sand watt tidal creeks watt area flat coast amrum föhr north sea schlick water gloss sparkle back light coasts watt worm pile sandworms sea holiday nordfriesland lugworm worm arenicola marina sand worm pier worm polychaete droppings wattwurmkot free pictures free photos free images royalty free free illustrations public domain
Hans (pixabay.com)
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