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

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.

Castle Geyser was named in 1870 by the Washburn-Langford-Doane Expedition due to its striking resemblance to the ruins of a castle. It has one of the oldest and largest sinter cones in Yellowstone, indicating that it has been active for thousands of years.

Subject: The Old Faithful Geyser in Yellowstone National Park. The geyser exhibit the spray Eruption once an hour, a famous tourist attraction in the park. Photographed in horizontal format.

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

Yellowstone National Park

World famous Old Faithful Geyser erupting in Yellowstone National Park, Wyoming, USA. The powerful steam and water eruption shoots high into the blue sky, framed by green forests and geothermal terrain. One of the most iconic natural wonders in the world, Old Faithful symbolizes Yellowstone travel, exploration, and the power of geothermal science.

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

Old Faithful

Old Faithful Geyser erupting at Yellowstone National Park

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

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

High above Old Faithful as it erupts for a large crowd, Yellowstone.

The famous Old Faithful geyser eruption in Yellowstone National Park, Wyoming backlit with a low afternoon sun

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

Old Faithful Yellowstone National Park, Wyoming, USA.

Old Faithful is a cone geyser located in Yellowstone National Park in Wyoming, United States of America. It was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name. It is a highly predictable geothermal feature, and has erupted every 44 minutes to two hours since 2000. The geyser and the nearby Old Faithful Inn are part of the Old Faithful Historic District.

The top of Old Faithful geyser shooting into the air in Yellowstone Park Wyoming with a blue sky

Eruption of the Great Fountain Geyser in 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

hotspring at yellowstone national park

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

$Old Faithful geyser spouting steam in the air.\n\nTaken in Yellowstone, National Park, Wyoming USA$

Old Faithful Geyser Eruption Yellowstone National Park Wyoming

Old Faithful Geyser, Yellowstone National Park, Wyoming, USA

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

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