Geyser Basin

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Geyser Basin

Photo by Ben Prepelka

The Geyser Basin region of Yellowstone National Park occupies the area of the huge Yellowstone Caldera. The entire floor of the caldera generates a tremendous amount of heat, just a few a hundred miles from the molten earth's mantle. Here, along the Firehole River, hot water and steam erupts to the surface as geysers, springs, mud pots, and steam vents.