Kushiro Marsh is Japan's largest wetland, located in Hokkaido. Spanning approximately 26,000 hectares, it is home to diverse ecosystems, including various plant species and wildlife. The marsh is particularly known for its rich birdlife, making it a popular destination for birdwatchers. The area is designated as a National Park and is part of the Kushiro Shitsugen National Park. Visitors can explore the marsh through walking trails and observation points, providing opportunities to appreciate its natural beauty and ecological significance. The marsh plays a crucial role in flood control and water purification in the region.