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 The largest rift zone in the Craters of the Moon National Monument and Preserve is the 62-mile long system of basalt crustal fractures appropriately named Great Rift. Located in the beautiful and rugged landscape of Idaho, the Craters of the Moon Lava Field were formed by magma that pushed up along the Great Rift. The Kings Bowl and Wapi lava fields were created from this fissure system as well. The magma that formed these National Park attractions came up along the Great Rift, but originated in a different magma chamber.
The Great Rift begins at the base of the Pioneer Mountains north of the Monument and extends for more than 50 miles to the southeast. Like the other volcanic rifts on the Eastern Snake River Plain, the Great Rift is parallel to the basin and range faults to the north and south of the plain.
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