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The Diemermeerpolder is a polder southeast of the center of Amsterdam. Until the beginning of the 17th century, this was the location of the Diemermeer or Watergraafsmeer, probably created around 1200 by a breach of the Diemerzeedijk. Originally, two lakes were formed, which were separated by a road. In the middle of the 14th century, this road disappeared and the lake was created. The lake was connected to the Zuiderzee via the Diem and flowed into the Amstel on the west side.
In the period 1627-1629 the lake was diked and drained. Because the polder was located deep (5.50 m NAP), the area was flooded several times. The last time was in 1672, when Amsterdam deliberately flooded the polder to ward off the threat of French troops.
Since the 19th century, the polder (former municipality and city district) has been known as Watergraafsmeer.