There are 19 polder windmills in Kinderdijk. They are aligned in two rows along the Nieuwe Waterschap canal. During your scenic excursion, you will walk or cycle among the mills on a two-lane path named Middelkade. Overwaard Windmill No.1 is the first in a series of wooden windmills on one side of the canal. Their scoop wheels drain water from the Lower Basin. On the other side are stone windmills called Nederwaard. They pump water to the Upper Basin. Their sweeping blades are so long they earned the nickname ground sailer. All of these windmills were built around 1740. There are also two Lekkerland polder windmills.