Hennesee is a reservoir located in the Sauerland region of Germany. It was created by damming the Henne River and is primarily used for water supply, flood control, and recreational activities. The lake covers an area of approximately 3.5 square kilometers and has a maximum depth of around 30 meters. Surrounded by lush forests and scenic landscapes, Hennesee is a popular destination for outdoor enthusiasts. Visitors can enjoy activities such as hiking, cycling, and water sports like sailing and swimming. The area also features walking trails and picnic spots, making it a great place for families and nature lovers.