 In 2018, Native American leaders have called for it to be renamed Buffalo Nation's Valley, because Hayden "advocated for the extermination of tribal people who refused to comply with federal dictates".The Hayden valley, centrally located in Yellowstone National Park, is approximately long north to south and wide east to west and occupies about of the park.It lies mostly the west of the Yellowstone River between Canyon and Yellowstone Lake, in Wyoming.