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Echinus Geyser

Largest Acid-water Geyser in the World

Geyser in Back Basin, Norris Geyser Basin on Tantalus Creek on Norris Geyser Basin Trail in Yellowstone NP, Rocky Mountains near Canyon Village, WY

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On Wikipedia

Echinus' eruptions are unpredictable. Its fountain reaches a height of as much as 40 to 60 feet (12 to 18 m), with a duration of about 4 minutes. Prior to 1998, this geyser was very regular, every 35 to 75 minutes. There were also major eruptions that lasted as much as 118 minutes. It is speculated that there was a secondary underground water source that used to power the major eruptions and that the connection to the source was severed leading to Echinus' current state.

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Waterbody