Old Faithful, Natural geyser in Yellowstone National Park, Wyoming, United States.
Old Faithful is a geyser in Yellowstone National Park in Wyoming that shoots superheated water and steam up to 180 feet (55 meters) into the air. The eruptions occur roughly every 90 minutes and last between one and a half and five minutes.
The Washburn-Langford-Doane Expedition documented and named this geyser in 1870 as the first in the park. Its fame helped make Yellowstone the first national park in the world in 1872.
The name comes from 1870 and refers to the reliable eruptions that have drawn visitors for over 150 years. People gather on wooden benches around the geyser and wait together for the next natural show.
Predictions for the next eruption are available at the Education Center and on the national park mobile app. The wooden boardwalks around the geyser provide space for many viewers and allow safe viewing from different angles.
Over one million eruptions have been documented since records began, more than any other geyser worldwide. Researchers developed mathematical formulas to predict intervals between eruptions, which is not possible for most geysers.
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