Geysers in Eruption, Upper Geyser Basin, Yellowstone Park, 1908-1909

Yellowstone National Park, established 1872, was America's first national park. Approximately two square miles in area, Upper Geyser Basin contains the largest concentrations of geysers in the park--in fact, nearly one-quarter of all the geysers in the world. It includes Old Faithful along with several other well-known geysers. Colorful hot springs and steaming fumaroles also exist here.