Geyser Basins of Yellowstone

Yellowstone National Park contains over half the world�s active geysers, with more than 700 within its 3,472 square miles. The most famous geyser is Old Faithful, named in 1870 during the Washburn-Langford-Doane Expedition. In 1871, the US Geological and Geographical Survey, led by Dr. F.V. Hayden, reached the Upper Geyser Basin. In just over a day, the explorers witnessed eruptions of many geysers still seen today, including Giantess, Beehive, Grotto, Castle, and Old Faithful. Yellowstone becam