The Hageland has many ridges. There is a geological explanation for this, because here you are sitting here with strongly incised witness hills of the Diestiaan Sea, named after the city of Diest. The Diestian Sea mainly flooded the north of Belgium in the period of the Tertiary (70 to 3 million years ago). Due to its composition, the sand there strongly clumps together into hard sandbanks. When these sandbanks were regularly exposed, the glauconite was weathered and the sand rusted together, creating a strong layer of iron sandstone .
Flemish Brabant
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