A natural feature such as a hole/eyehole, stalagmite, rock flake/spike/bollard, rock bridge/column/pillar, chockstone (a rock wedged in a fissure), boulder or tree, which is used instead of an anchor. Usually requires a sling to make it safe, and avoid friction damage to the rope. Thread may be used to refer to any kind of natural that the rope has to be fed through, including an eyehole or gap between boulders, or an Abalakov thread.
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