description Mammoth Cave (Idaho) Overview
help Mammoth Cave (Idaho) FAQ
Is Mammoth Cave in Idaho the same as Mammoth Cave in Kentucky?
No. Idaho's Mammoth Cave is a lava tube on the Shoshone lava flow, while Kentucky's Mammoth Cave is a limestone cave system. The Idaho attraction is also separate from the nearby Shoshone Ice Cave. [Idaho's Mammoth Cave](https://idahosmammothcave.com/)
What are the main formations inside Mammoth Cave in Idaho?
The cave is known for lava stalactites and other features left by cooling volcanic rock, not the water-made calcite formations associated with Kentucky. That makes the Shoshone lava flow central to understanding its interior.
How long is Mammoth Cave in Idaho?
A published Idaho reference describes the lava tube as nearly one mile long, or about 1.6 kilometres. Treat that as an approximate mapped length because individual sources may measure accessible passages differently. [Idaho reference](https://objects.lib.uidaho.edu/fwres/fwres16.pdf)
Why is this item labeled Mammoth Cave (Idaho)?
The location tag separates it from the much better-known Mammoth Cave National Park in Kentucky. Naming the state is important because Idaho's site is a volcanic lava tube associated with Shoshone, not a limestone show cave in the eastern United States.
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