It was created thousands of years ago by a melting glacier. The specific geological structure has been of big importance. The average thickness of the sand layer is about 40 metres (131 ft), with a maximum of 70 metres (230 ft), which made the fast and deep drainage very easy.
The sea’s activity in Słowiński National Park created sand dunes which in the course of time separated the bay from the Baltic Sea. As waves and wind carry sand inland the dunes slowly move, at a speed of 3 to 10 metres (9.8 to 32.8 ft) meters per year. Some dunes are quite high – up to 30 metres (98 ft). The highest peak of the park — Rowokol (115 metres / 377 feet above sea level) — is also an excellent observation point.
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