(public domain photo provided by the American National Park Service; original taken by George Marler)
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Witches Cauldron is a geyser along the northeastern banks of the Firehole River in the western Grand Group of Yellowstone's Upper Geyser Basin. It is an irregularly-shaped, blue water-filled pool about 11 x 8 meters in size. Its activity consists of constant roiling and bubbling with some moderately-low surging.
In 1999, researchers measured the water's temperature at 95 degrees Celsius, with a pH of about 8.2 (= slightly alkaline).
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