On November 18, 1421, a storm in the North Sea slammed into the European coastline. Over the next several days, approximately 10,000 people in what is now the Netherlands died in the resulting floods. History.com tells us the lowlands of the Netherlands near the North Sea were densely populated at the time, despite their known vulnerability to flooding. Small villages and a couple of cities had sprung up in what was known as the Grote-Waard region.
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