Grand Geyser, Hydrothermal fountain in Upper Geyser Basin, Yellowstone National Park, United States.
Grand Geyser is a hydrothermal fountain in the Upper Geyser Basin of Yellowstone National Park. It shoots multiple bursts of heated water during each eruption cycle, with columns reaching up to 200 feet (60 meters) high.
Ferdinand Vandeveer Hayden documented and named this site during his geological expedition in the nineteenth century. His work helped bring attention to Yellowstone as a geological wonder worthy of protection.
The name reflects the respect early explorers had for its power and scale. Today visitors see colorful mineral deposits and hot springs dotting the landscape around it.
Check eruption predictions at the nearby Old Faithful Visitor Center and arrive about 30 minutes early to get good viewing spots. The site sits along a marked trail that branches from the main basin path.
It ranks among the world's tallest predictable geysers and displays an unusual eruption pattern with several distinct bursts rather than a single continuous spray. This multi-peak behavior makes each eruption visually more complex than neighboring geysers.
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