Harriman State Park is a park in eastern Idaho, USA. It is located on an 11,000-acre (45 km2) wildlife refuge in the Greater Yellowstone Ecosystem.
It is home to an abundance of 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.
The land was deeded to Idaho for free in 1977 by Roland and W. Averell Harriman.
Reference: Wikipedia