The Afsluitdijk is a major dam in the Netherlands, completed in 1932. It stretches about 32 kilometers (20 miles) and connects the provinces of North Holland and Friesland. The dam was built to protect the land from the sea and to create the IJsselmeer, a large freshwater lake. The Afsluitdijk is an engineering marvel, featuring a roadway on top for vehicles. It plays a crucial role in flood protection and water management in the region. The structure also supports various ecosystems and is a popular spot for cycling and walking, attracting many visitors each year.