The world's largest acidic geyser is putting on a show again, erupting for the first time in six years after a quiet hiatus, officials at Yellowstone National Park say. The Echinus Geyser - located in ...

YELLOWSTONE NATIONAL PARK, Wyo. — Yellowstone’s Echinus Geyser—the largest acidic geyser on Earth—is putting on a show with a rare and spectacular reawakening. Located in the Back Basin of the Norris ...

WASHINGTON — Yellowstone's Echinus Geyser, which is the largest acidic geyser in the world, came out of five years of dormancy last month to start erupting several times a day, according to the U.S.

Tucked inside Norris Geyser Basin, the hottest and most geologically restless thermal area in all of Yellowstone National Park, Echinus Geyser has been quiet for years. But in early February 2026, ...

CODY — During the afternoon of July 14, the U.S. Geological Survey announced the discovery of a new geothermal pool in Yellowstone National Park’s Norris Geyser Basin. Michael Poland, Ph.D., the ...

The world’s largest acidic geyser in Yellowstone National Park is erupting again after a six-year slumber. The Echinus Geyser, situated in the Norris Geyser Basin, last erupted in December 2020.