Giantess Geyser, Fountain geyser in Upper Geyser Basin, Yellowstone National Park, Wyoming, US.
Giantess Geyser is a fountain-type geyser in the Upper Geyser Basin of Yellowstone National Park and features a large deep pool with boiling water at its center. The pool's edges are lined with thin mineral deposits that shift with each eruption.
The geyser was documented during the Washburn-Langford-Doane Expedition of 1870 by Walter Trumbull, who recorded its characteristics and eruption patterns in detail. This early observation helped scientists better understand Yellowstone's geothermal systems.
The name Giantess refers to the powerful water jets shooting from the ground that capture visitors' attention. The area is shaped by the daily rhythms of geothermal activity, which continuously transforms the landscape.
The geyser erupts between two and six times yearly, shooting water up to 200 feet high. Eruptions can last from several hours to about 2 days, so follow ranger predictions to time your visit.
Before each eruption, the ground shakes noticeably from underground steam explosions happening several kilometers below the surface. These tremors offer a glimpse of the immense forces operating beneath your feet.
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