Old Faithful, Natural geyser in Yellowstone National Park, Wyoming, United States.
Old Faithful releases superheated water and steam reaching heights of 180 feet during eruptions that occur approximately every 90 minutes.
The Washburn-Langford-Doane Expedition first documented and named this geyser in 1870, making it the first named geyser in Yellowstone National Park.
The geyser stands as a symbol of natural conservation and influenced the establishment of Yellowstone as the first national park in 1872.
Visitors can check precise eruption predictions at the Education Center or through the National Park Service mobile application.
Scientists have documented over one million eruptions of Old Faithful, with mathematical formulas developed to predict intervals between events.
Location: Teton County
GPS coordinates: 44.46045,-110.82818
Latest update: May 26, 2025 19:05
Geysers represent some of the most visible expressions of hydrothermal activity, occurring where underground water reservoirs are heated by magmatic sources. Yellowstone National Park in Wyoming holds more than half of the world's known geysers, including Old Faithful with its reliable eruptions every 90 minutes and Steamboat, the tallest active geyser on Earth. Iceland offers the Haukadalur Valley, home to the namesake Geysir and Strokkur, which erupts every few minutes. The high plateau of El Tatio in Chile sits at 14,100 feet (4,300 meters) and forms the highest elevation geyser field in the world. Other notable locations include the Whakarewarewa thermal area in Rotorua on New Zealand's North Island, where the Pohutu geyser performs regularly, and the Valley of Geysers in Russia's Kamchatka Peninsula. These sites demonstrate the ongoing volcanic activity beneath the Earth's surface and attract visitors interested in observing natural thermal phenomena. Eruption patterns vary in frequency and intensity, with some geysers following predictable schedules while others remain irregular.
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