Big Hole National Battlefeild is a unique unit in the National Park Service. This park is one of thirty-eight sites that is part of Nez Perce National Historical Park. Unlike other sites that have a contiguous block of land, Nez Perce National Historical Park stretches across Oregon, Idaho, Washigton, and Montana. Of the park's thirty-eight sites, the National Park Service owns nine and each one offers its own set of challenges and opportunities.