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Old Faithful
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Yellowstone National Park: Old Faithful Old Faithful, Wyoming Old Faithful Yellowstone National Park: Old Faithful Old Faithful Yellowstone National Park: Old Faithful Old Faithful
Tour Yellowstone National Park's geysers and hot springs and observe its wildlife
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Yellowstone National Park: Old Faithful
Yellowstone National Park: Old Faithful Old Faithful geyser erupting in Yellowstone National Park, Wyoming, U.S.

Old Faithful

geyser, Wyoming, United States
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History

Old Faithful, geyser, northwestern Wyoming, U.S., located at the head of the Upper Geyser Basin in Yellowstone National Park. Old Faithful is the most famous, though not the highest, of all North American geysers. It was so named in 1870 by the Washburn-Langford-Doane Expedition because it seemed to spout “faithfully” every 63 to 70 minutes. Continuous observation revealed, however, that the eruptions occurred with some irregularity, the intervals varying from 33 to 120 minutes. After...

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