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Morning Glory pool at Yellowstone National Park, Wyoming, USA.

Castle Geyser at Yellowstone national park.

Grand Prismatic Spring in Yellowstone National Park

Erupting geyser at Lower Geyser Basin, Yellowstone National Park, Wyoming, USA

Geysers at Midway Geyser Basin Trailhead, Yellowstone National Park.

Yellowstone pictures collage of different locations landmark of Yellowstone National Park, Wyoming, United States. Castle Geyser erupts with hot water and steam in background.

Old faithful geyser eruption at sunny blue sky, Yellowstone National Park, USA.

Steamboat Geyser in Norris Basin in Yellowstone park, WYO, USA.

Forests and meadows along the Grand Loop road in Yellowstone National Park Lower geyser basin

Yellowstone National Park, Wyoming, USA: Old Faithful is a cone geyser located in Yellowstone National Park, Wyoming, renowned for its relatively predictable eruption pattern that occurs approximately every 90 minutes, though intervals can range from 60 to 110 minutes depending on the duration of the previous eruption. The geyser shoots a column of boiling water to heights averaging 130-140 feet (40-43 meters), with eruptions lasting between 1.5 to 5 minutes and expelling 3,700 to 8,400 gallons (14,000 to 32,000 liters) of water. Named during the 1870 Washburn Expedition for its consistent activity, Old Faithful is powered by underground thermal features where superheated water under pressure periodically flashes to steam, creating the eruption cycle. As one of more than 500 geysers in Yellowstone—which contains over half of the world's geysers—Old Faithful has been erupting in its current pattern for hundreds of years, making it one of the park's most studied and visited thermal features, with its activity carefully monitored and predicted by the National Park Service based on the duration and strength of each eruption.

Old Faithful Geyser erupting at Yellowstone National Park

Black Diamond Pool Geysers at Yellowstone National Park. Biscuit Basin Trail.

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

Yellowstone National Park turquoise thermal pool, Wyoming, USA.

Geysers in Yellowstone

White water erupts from Old Faithful geyser at Yellowstone National Park against a bright blue sky on a sunny summer day

Old Faithful geyser erupting in the winter in Yellowstone National Park, Wyoming.

close up of hot blasting water from active gushing gayser in yellowstone national park in america, usa

Geyser eruptions in the Yellowstone National Park, USA, UNESCO World Heritage Site

Geysers at Midway Geyser Basin Trailhead, Yellowstone National Park.

Closeup of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA

Old Faithful Geyser is one of the most famous geysers in the world, known for its regular eruptions. It was named in 1870 for its reliability in spewing hot water and steam at intervals of 60 to 110 minutes, reaching heights of 100 to 180 feet. Each eruption lasts about 1.5 to 5 minutes, discharging up to 8,400 gallons of water. Old Faithful is fueled by geothermal activity from the Yellowstone Caldera, a supervolcano, and has erupted more than a million times since the park's founding.

Steam from the geothermal area of Lower Geyser Basin into a blue sky.

Beautiful abstract view of Sapphire Pool in Yellowstone National Park

Yellowstone Rainbow Pool in Winter

close up of hot blasting water from active gushing gayser in yellowstone national park in america, usa

A small geyser near the river at the national park.

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View of geyser runoff in Yellowstone national park.jpg

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