tree grows over collapsed lava cave

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Collapsed lava tube cave.­

Ancient lava flows in the Shasta-Trinity National Forest (California).­

More images of ▶ basalt cave cave mouth caving forest lava lava beds lava cave lava tube lava tube cave natural cave rock rock formation shasta-trinity national forest spelunking stone tree volcanic
Volcanic Areas of the Pacific North-West
Medicine Lake Road, California, USA