Echinus is the largest known acidic geyser on Earth.

Yellowstone’s Echinus Geyser awakens after years of dormancy, offering rare eruptions and unforgettable experiences for ...

The world’s largest acidic geyser has erupted in Yellowstone National Park after remaining largely dormant since 2017. The ...

The largest acidic geyser in the world, Echinus Geyser, is active again, with eruptions occurring every 2 to 5 hours, ...

Echinus Geyser in Yellowstone National Park, a rare acidic geyser and the largest in the world, has recently been observed ...

The geyser really came alive in fall 2017. From October 18 to November 10, 2017, Echinus consistently erupted roughly about ...

In early February 2026, repeated surges of the geyser began—as before, with the surface becoming agitated and releasing more ...

Learn more about the Echinus Geyser at Yellowstone Park, which recently erupted, but may not sustain into the summer.

When geologists study volcanic hazards or try to anticipate what a volcano may do in the future, one of their primary tools is to examine the volcano’s past behavior.

Yellowstone has documented an eruption from its Echinus Geyser, which slowly ceased erupting in the decades leading up to ...

Grizzle bears are not known to travel in herds like this all at once and great distances, and they are headed towards Salt Lake City, Utah." ...

Echinus Geyser in Yellowstone National Park’s Norris Geyser Basin is erupting again for the first time since 2020, after ...