natural passage
Nature-formed opening path
A natural passage is an opening or channel formed by geological or biological processes rather than human construction.
The phrase typically describes caves, tunnels through rock, or pathways through dense terrain: We found a natural passage through the cliffs.
In anatomy, it refers to bodily channels like the nasal or birth canal.
The term distinguishes what nature created from what was excavated, drilled, or built.
- corridorEnclosed connecting walkway
- wind tunnelControlled airstream apparatus
- channelPassage for transmission
- pathwayDesignated route for travel
- straitConstricted marine passage
narrow strait · gorge · river gorge · canyon · cave · sea cave · opening · waterway · artery · trade route · throat · birth · birth canal · migration · route · conduit · gap · narrows
natural passagetunnel
Enclosed underground route
subway tunnel · canal · aqueduct · culvert · mine shaft
natural passagedead end
Passage without outlet
blocked passage · obstruction · barrier · cul-de-sac · impasse
natural passagenatural barrier
Terrain that blocks passage
rock wall · cliff face · blocked passage · dead end · box canyon
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