Yellowstone National Park is known as the world's first national park, primarily due to its unparalleled collection of geysers, hot springs, mudpots and steam vents.
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Old Faithful, located in the world's largest concentration of active geysers.
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| Excelsior Geyser Crater |
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| Firehole Spring |
The biggest difference between a geyser and a hot spring is that a geyser has an obstruction in its hydrothermal plumbing near the surface. In hot springs, water is allowed to circulate freely, giving off steam and heat. In geysers, constrictions keep the boiling water underground.
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| White Dome Geyser |
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| Celestine Pool |
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| Firehole River |
Grand Prismatic Hot Spring, the third largest spring in the world, is 370 feet in diameter. The rainbow of colors is caused by the different species of heat-loving bacteria.
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| Clepsydra Geyser |
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| Fountain Paint Pot |
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| Tower Falls |
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| Mammoth Hot Springs |
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| Dragon's Mouth |
Aptly named, the Dragon's Mouth produces a voluminous belching of steam and that is recognized long before you can see it.
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| Dust bath! |
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| Upper Yellowstone Falls |
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| Grand Canyon of the Yellowstone River |
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