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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 sunset in Yellowstone National Park

Most popular geyser in the world, the Old Faithful geyser in the Yellowstone National Park. USA.

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

Yellowstone National Park

Old Faithful Geyser in the Upper Geyser Basin of Yellowstone National Park in the winter with steam. Sun.

Yellowstone National Park, Wyoming, United States - August 18, 2017: The cone geyser called Old Faithful is erupting hot steam in the twilight. This geyser is part of the Old Faithful Historic District.

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

Old Faithful Geyser, Yellowstone National Park

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.

Mammoth Hot Springs feature in Yellowstone National Park

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

Old Faithful is the most famous of Yellowstone's approximately 500 geysers.

Old Faithful Geyser in the Upper Geyser Basin of Yellowstone National Park. Eruption with lots of steam.

Old Faithful Yellowstone National Park, Wyoming, USA.

Old Faithful

Fountain under pressure

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

Old Faithful Geyser erupting at Yellowstone National Park

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

This image captures a dramatic scene of a geyser eruption, with thick clouds of steam billowing into the air. The geyser is releasing a powerful stream of hot water and steam, creating a striking contrast against the clear blue sky.

Sivas Altınkale hot spring from ground to pond

Photo taken in Yellowstone Park, United States

Old Faithful Geyser, Yellowstone National Park, Wyoming, USA

Image of Old Faithful going off on schedule in Yellowstone winter

Old Faithful Geyser in Yellowstone Park

Eruption of the Great Fountain Geyser in Yellowstone National park.

Close up of steaming and gushing old faithful geyser in thermal nature of yellowstone national park in america, usa

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