Horicon Marsh is a large wetland located in Wisconsin, covering over 32,000 acres. It is one of the largest freshwater marshes in the United States and serves as a vital habitat for a variety of wildlife, including migratory birds, amphibians, and fish. The marsh is part of the Horicon Marsh National Wildlife Refuge, which was established to protect its unique ecosystem. The area is popular for outdoor activities such as birdwatching, hiking, and photography. Visitors can explore numerous trails and observation points, making it an ideal destination for nature enthusiasts. The marsh also plays a crucial role in flood control and water quality improvement in the region.