Calslagen is a hamlet in the Dutch

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 province of North Holland

North Holland

North Holland |West Frisian]]: Noard-Holland) is a province situated on the North Sea in the northwest part of the Netherlands. The provincial capital is Haarlem and its largest city is Amsterdam.-Geography:...

. It is a part of the municipality of Aalsmeer

Aalsmeer

Aalsmeer is a municipality and a town in the Netherlands, in the province of North Holland. Its name is derived from the Dutch for eel and lake . Aalsmeer is bordered by the Westeinderplassen lake, the largest open water of the Randstad, and the Ringvaart Canal...

, and lies about 9 km south of Hoofddorp

Hoofddorp

Hoofddorp is the main town of the Haarlemmermeer municipality in the province of North Holland in the Netherlands. In 2009, the population was just over 73,000...

.

Until 1854, Calslagen (then spelled "Kalslagen") was a separate municipality, under the name of Kalslagen en Bilderdam.

The statistical area "Calslagen", which covers the hamlet and a large part of the lake area Westeinderplassen

Westeinderplassen

The Westeinderplassen are a complex of lakes belonging mostly to the territory of Aalsmeer, the Netherlands. Their total area is circa 10 km2, making it the largest freshwater body of water in the Randstad area.-Geography:...

, has a population of around 550.