Former lakes of the Netherlands

Haarlemmermeer () is a municipality in the west of the Netherlands, in the province of North Holland. Haarlemmermeer is a polder, consisting of land reclaimed from water. The name Haarlemmermeer means 'Haarlem's lake', referring to the body of water from which the region was reclaimed in the 19th century.

Beemster () is a former municipality in the Netherlands, in the province of North Holland. The Beemster is the first polder in the Netherlands reclaimed from a lake, the water extracted by windmills between 1609 and 1612. The original well-ordered landscape of fields, roads, canals, and dykes has been preserved intact. A grid of canals parallels the grid of roads in the Beemster. The larger feeder canals are offset by approximately one kilometer from the larger roads.