Dutch mountains

The Sallandse Heuvelrug National Park, located in the triangle Nijverdal, Haarle and Holten, is nowhere really flat. At the highest points you have a view of the land behind the ridge and then you notice that the surrounding land is hillless. The answer lies hidden in history. About 130,000 years ago, after a cold period, the thaw came. The ice melted, the seas filled with water again and the disappeared landscape returned, only now it was a hilly landscape. With a pleasant climate, slightly warmer even than now. But ten thousand years later the cold came again, although this time the land ice did not reach the Netherlands. This ice age, called Weichselian, lasted until about 12,000 years ago. By the end of this ice age, it was a polar plain with endless storms and temperatures down to -30 degrees Celsius. The storms blew sand from the dried-up North Sea over Salland and filled the valleys with fine yellow sand, called cover sand. Only the Sprengenberg and some other hilltops did not disappear under that yellow sand sea.

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