Kinderdijk is a village in the Netherlands, belonging to the municipality of Molenwaard, in the province South Holland, about 15 km (9 miles) east of Rotterdam. Kinderdijk is situated in a polder in the Alblasserwaard at the confluence of the Lek and Noord rivers. To drain the polder, a system of 19 windmills was built around 1740. This group of mills is the largest concentration of old windmills in the Netherlands. The windmills of Kinderdijk are one of the best-known Dutch tourist sites. They have been a UNESCO World Heritage Site since 1997. The name Kinderdijk is Dutch for "Children dike". During the Saint Elizabeth flood of 1421, the Grote Hollandse Waard flooded, but the Alblasserwaard polder stayed unflooded. It is said that when the terrible storm had subsided, someone went to the dike between these two areas to see what could be saved. In the distance he saw a wooden cradle floating on the water. As it came nearer, some movement was detected. A cat was seen in the cradle trying to keep it in balance by jumping back and forth so that no water could get into it. As the cradle eventually came close enough to the dike for a bystander to pick up the cradle, he saw that a baby was quietly sleeping inside it, nice and dry. The cat had kept the cradle balanced and afloat. This folktale and legend has been published as "The Cat and the Cradle".