1. USGS Thesaurus
Categories > physiographic features
cliffs
High vertical, near-vertical, or overhanging faces of rock, earth, or ice. [USGS Circ. 1048]
This category is also used for bluffs, clefts, escarpments, precipices, and scraps
Subtopics
(none)
See also
canyons
ledges
ridges
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