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Harriman State Park is a public recreation area situated on the 11,000-acre (4,500 ha) Harriman Wildlife Refuge in Fremont County, located three miles (4.8 km) south of Island Park in eastern Idaho, United States. The state park is located within the Henry's Fork Caldera, which is part of the Greater Yellowstone Ecosystem. It serves as a habitat for various wildlife, including elk, moose, sandhill cranes, trumpeter swans, and the occasional black or grizzly bear. Two-thirds of the trumpeter swans that winter in the contiguous United States spend the season in Harriman State Park.