Snow-covered Amphitheater Mountain with a blue sky background.
Dramatic snow-covered Amphitheater Mountain.
NPS
Environmental Factors
Sizes, boundaries, and descriptions of any ecosystem vary. In general, we say that the Greater Yellowstone Ecosystem consists of 12-22 million acres and 18,750-28,000 square miles. It is located in Wyoming, Montana and Idaho and encompasses state lands, two national parks, portions of five national forests, three national wildlife refuges, Bureau of Land management holdings and private and tribal lands. Learn More…