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In page Zuiderzee:

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The even more massive St. Lucia's flood occurred 14 December 1287, when the seawalls broke during a storm, killing approximately 50,000 to 80,000 people in the fifth largest flood in recorded history. The flood occurred during a memorable storm in Friesland and Holland, and came from the North Sea, breaking and destroying several dams and dunes and transforming it into a bay which was then called the Zuiderzee,[citation needed] meaning Southern Sea.[1] The name "Zuiderzee" came into general usage around this period.[citation needed]