The Grotto Geysir is a Geysir in the upper Geysir basin of the Yellowstone national park in the USA.

The Geysir received its names 1870 from the Washburn Langford Doane expedition, which explored the area for the first time.

The Grotto Geysir is a jump-well-like Geysir. Its eruptions take place about every 8 hours and can continue from 90 minutes to more than 10 hours. There were already eruptions, which took more than 24 hours. The discharged water reaches only a height of up to 10 m, but however a large quantity water is discharged.

The strange form of the Geysirkegels, to which the Grotto Geysir owes its name, probably resulted from sinter deposits of the Geysir eruptions on stumps.

The Grotto Geysir is part of the Grotto group designated after it. This group with its connections and mutual influences belongs one on the other to the most complex Geysir groups of the Yellowstone national park. The Grotto group is besides with the Giant Geysir connected.

Related links

• National park service: Grotto Geysir (English)
• Film over the Grotto Geysir

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