thumb|right|300px|Historical map of the Netherlands (1658) with the Zuyder Zee The Zuiderzee or Zuider Zee (; old spelling Zuyderzee or Zuyder Zee), historically called Lake Almere and Lake Flevo, was a shallow bay of the North Sea in the northwest of the Netherlands. It extended about inland and at most wide, with an overall depth of about and a coastline of about . It covered . Its name is Dutch for "southern sea", indicating that the name originates in Friesland, to the north of the Zuiderzee (cf. North Sea).
The Zuiderzee was a shallow bay of the North Sea in the northwestern Netherlands that extended inland for a considerable distance and covered a large area. It matters historically because it was a significant geographical feature of the Dutch landscape, eventually becoming the subject of major water management projects that transformed the region.
AI-generated from the Wikipedia summary — may contain errors.
thumb|right|300px|Historical map of the Netherlands (1658) with the Zuyder Zee The Zuiderzee or Zuider Zee (; old spelling Zuyderzee or Zuyder Zee), historically called Lake Almere and Lake Flevo, was a shallow bay of the North Sea in the northwest of the Netherlands. It extended about inland and at most wide, with an overall depth of about and a coastline of about . It covered . Its name is Dutch for "southern sea", indicating that the name originates in Friesland, to the north of the Zuiderzee (cf. North Sea).
It is generally acknowledged that the Zuiderzee existed from roughly 1170, following the devastating All Saints' Flood, until 1932, when the Afsluitdijk was completed. The majority of the Zuiderzee was closed off from the North Sea, leaving the mouth of the inlet to become part of the Wadden Sea. The salt water inlet changed into a fresh water lake now called the IJsselmeer (IJssel Lake) after the river that drains into it, and by means of drainage and polders, an area of some was reclaimed as land. This land eventually became the province of Flevoland. Part of the IJsselmeer was also divided into the Markermeer.
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