The third polder of the Zuiderzee Works is Eastern Flevoland. This polder is located in the province of Flevoland and is surrounded by the Ketelmeer, Vossemeer, Drontermeer, Veluwemeer, IJsselmeer and the Knardijk. The polder was constructed between 1950 and 1957 and has a size of 540 km². In the polder lies the city of Lelystad , the villages of Dronten, Swifterbant, Biddinghuizen and the hamlets Ketelhaven and Roggebotsluis, and a small part of the hamlet of Harderhaven. The main road is the A6. Furthermore, the Flevolijn and the Hanzelijn are located in Eastern Flevoland.