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Old Faithful Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Yellowstone National Park - Wyoming, USA (IMG_5659.jpg)

Old Faithful Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA

The Upper Geyser Basin contains the largest concentration and nearly one-quarter of all of the geysers in the world. A variety of thermal features exist here: spouting geysers, colorful hot springs, and steaming fumaroles. The Upper Geyser Basin is the home of Old Faithful, the most famous and celebrated geyser in the world. The intervals between eruptions average between 45-90 minutes (depending on the duration of the previous eruption) and the average duration is about four minutes. Eruptions can shoot 14,000 to 32,000 L (3,700 to 8,400 US gallons) of boiling water to a height of 32 to 56 m (106 to 185 feet).
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