Recorded eruptions of Vault Geyser
are few in number, and the vent usually presents a calm appearance, filled with hot, blue water. Historically, activity was linked to Giantess Geyser
just to the south, as is the case for half a dozen other pools nearby. Giantess sits at the edge of a little hill, overlooking the Firehole River, and is one of the most spectacular geysers in the basin, but if performs unpredictably, only a few times each year, when boiling water and steam are ejected to over 200 feet. Eruptions last for several hours, or even days. The geyser was named in 1870, along with Old Faithful and several others, on account of its great size.
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