kept a saline-freshwater balance, and northward flow, enabling islands and banks to build up. Among these are rare zones just above sea level: Kampen, Elburg and north-east bank once wooded strip from Nijemirdum to Stavoren.

However, the North Sea, locally to form (or re-form) the Zuiderzee, reasserted itself – the so-called Dunkirk transgressions.

By the time these

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