Echinus Geyser, Acid geyser in Norris Geyser Basin, Yellowstone National Park, Wyoming.
The Echinus Geyser releases bursts of steam and water that reach heights between 40 to 60 feet during its active eruption phases.
Before 1998, the geyser maintained regular eruptions every 35 to 75 minutes, but its behavior changed significantly after this period, becoming unpredictable.
Scientists named this natural formation after sea urchins due to the spiny appearance of its geyser cone during geological surveys in the 1870s.
Visitors should check with park rangers about current eruption patterns, as the geyser now exhibits sporadic activity with infrequent eruptions.
The waters of this geyser measure a pH between 3.3 and 3.6, making it the largest acid-water geyser discovered on Earth.
Location: Wyoming
GPS coordinates: 44.72240,-110.70100
Latest update: March 8, 2025 10:10
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