Tissø is a large lake located in the western part of Zealand, Denmark. It covers an area of approximately 18 square kilometers and is known for its rich biodiversity, including various fish species and birdlife. The lake is a popular destination for outdoor activities such as fishing, hiking, and birdwatching. The surrounding area of Tissø features scenic landscapes and historical sites, including ancient burial mounds and remnants of Viking settlements. The lake is also part of the Tissø Nature Reserve, which aims to protect its unique ecosystems and promote conservation efforts in the region.