IJsselmeer is a large freshwater lake located in the central Netherlands, created in the 20th century after the completion of the Afsluitdijk, a dam that closed off the Zuiderzee, a shallow bay of the North Sea. The IJsselmeer covers an area of approximately 1100 square miles (2900 square kilometers) and has an average depth of 16 feet (5 meters).

The lake is a popular destination for fishing, sailing, and other water sports, with numerous marinas and harbors located along its shores. It is also an important source of drinking water for many towns and cities in the region. The IJsselmeer is home to a variety of fish species, including perch, eel, and pike, and provides an important habitat for migratory birds, such as geese and ducks.

The surrounding area of the IJsselmeer is known for its picturesque villages, historic towns, and scenic countryside. The region is popular for cycling, hiking, and camping, with many campgrounds and bike trails located in the vicinity of the lake. In addition, the IJsselmeer is a popular spot for windsurfing and kitesurfing due to its strong winds and relatively calm waters. The lake is also home to a number of small islands, such as Marken and Urk, which offer a glimpse into traditional Dutch culture and architecture.