Ape Cave
CountryUSA
RegionWashington
Discovered1946
Size/Depth4 km surveyed
About Ape Cave
The longest continuous lava tube in North America. Formed by an eruption of Mount St. Helens 2,000 years ago. Named after the Mount St. Helens Apes, a hiking club. Two sections: lower (easy) and upper (challenging). The lava shelf and flow marks are clearly visible.
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