Echinus Geyser in Yellowstone National Park, a rare acidic geyser and the largest in the world, has recently been observed actively erupting again for the first time since 2020.

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

Echinus is the largest known acidic geyser on Earth.

Add Yahoo as a preferred source to see more of our stories on Google. Echinus Geyser, located in Yellowstone's Norris Geyser Basin, is the largest acid-water geyser in the world, with a pH of 3.3–3.6 ...