- - Gulches
- - Western gulches.
- - valleys formed by erosion
- - Some valleys
- - Narrow steep-sided valleys
- - Steep-sided valleys
- - They're simply gorges
- - Coulees
- - Products of erosion
- - Eroded valleys
- - They're made by running water
- - Rivers run through them
- - Steep valleys
- - Runoff sites
- - Chavez and others
- - Canyons' relatives.
- - Valleys caused by erosion.
- - Mountain gorges.
- - Deep gorges.
- - Arroyos.
- - Low places
- - Gaps
- - Gorges
- - Gullies
- - Chasms
- - Ditches
- - Mountaineers' challenges
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