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Due to the fact that the wind cames almost from West, the waves become the same direction, from W to E, and wash the sand away
To stop/make less this washout effect, to break the stronght of the waves - that's the reason of this pillars. In the northern part of Zeeland there are beaches , many km long, and there are this pillars, always two lines together, repeating so about 500m. Depending from tide/low tide you can see 2,0m or nothing from them.

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