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What is a "Reentrant"?
Apart from a few geologists, only orienteers regularly use the English word
"re-entrant" (or reentrant) to describe a landform.
A reentrant appears on the map as a U or V shape in the contour lines,
pointing back into a hillside rather than sticking out of the hill (as would a spur).
So a reentrant is a small valley, the center of which would collect water and funnel it downhill
(if it were raining hard).
This portion of a map includes several reentrants, three of which are circled.
The west-most is a small, v-shaped reentrant,
while the two eastern examples are broad and somewhat shallow.
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