Lelystad is in Flevoland.
Lelystad is approximately 3 metres (9. 8 feet) below sea level. Lelystad is built on the seabed of the former Zuiderzee. About 6500 years ago this wetland was above high tide level and inhabited; the Netherlands have steadily subsided since. Near Lelystad at Swifterbant, the oldest human skeletons in Western Europe were discovered. Due to rising water levels and storms, the peatlands were washed away, and the Lacus Flevo (in Roman times) grew to be the Almere (Middle Ages) and became the Zuiderzee. The Zuiderzee (Southern Sea) was the main transport route from Amsterdam to the North Sea and the Hanseatic League cities. Due to the many shipwrecks in Flevoland, Lelystad now houses the National Centre for Maritime History, with a museum and the shipyard that has built the Batavia replica. After the Second World War the Zuiderzee Works continued, constructing the polder of Eastern Flevoland. In 1950 work commenced on several construction islands in the middle of the IJsselmeer.