The Broekpolder is a wildlife and recreation area in Vlaardingen. It used to be a peat meadow polder with a number of dairy farmers, and it was later decided that houses should be built in the polder. The ground was raised with dredged material, but this polluted soil turned out not to be a good basis for construction. That is why the area was partly planted with production forest and otherwise returned to nature. It is now a beloved nature and recreation area for the people in Vlaardingen and an important link in strengthening nature in and around the city.