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World's Largest Acidic Geyser Erupts Again After Six Years

3/3/2026

Summary

Story summary

Echinus Geyser, the world's largest acidic geyser in Yellowstone National Park, has resumed eruptions after six years.
It began showing activity in early February 2026, with eruptions reaching 20–30 feet.
Echinus sits in Norris Geyser Basin and has acidic water that does not erode rocks.
Current eruptions are expected to diminish before the summer tourist season.
Visitors can monitor activity via temperature graphs on the Yellowstone Volcano Observatory website.

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Story summary

Echinus Geyser, the world's largest acidic geyser in Yellowstone National Park, has resumed eruptions after six years.
It began showing activity in early February 2026, with eruptions reaching 20–30 feet.
Echinus sits in Norris Geyser Basin and has acidic water that does not erode rocks.
Current eruptions are expected to diminish before the summer tourist season.
Visitors can monitor activity via temperature graphs on the Yellowstone Volcano Observatory website.