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Giant Geyser

Geyser in Giant Group, Upper Geyser Basin on Firehole River on Upper Geyser Basin Trail in Yellowstone NP, Rocky Mountains near Old Faithful, WY

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Giant Geyser is a cone-type geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Giant Geyser is the namesake for the Giant Group of geysers, which includes Bijou Geyser, Giant Geyser, and Mastiff Geyser. Giant Geyser is also the namesake for the Giant Platform, a raised stone structure incorporating all these geysers. Giant is notable for its spectacular, but sporadic eruptions, as well as for its very large cone of geyserite, which stands about 12 feet tall.