quicksand danger warning sign coastal saltmarsh west frisian island schiermonnikoog low tide waddensea netherlands |
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| navigate by keyword : coast coastal danger dangerous dutch europe european flat flats friesland frisian green hazardous holland island landscape low marsh marshes marshland nature netherlands panorama path quicksand safety salt saltmarsh schiermonnikoog sea sign signpost sinking tidal tide triangle triangular vast wadden waddensea warning west wetland wetlands |
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| Warning sign for dangerous quicksand in salt marshes of coast of West Frisian island Schiermonnikoog at low tide of Wadden Sea, Netherlands |
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