box canyon

a canyon with steep side walls terminating headwards in a vertical cliff.

1870–75, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
box canyon
(Western US) a canyon with vertical or almost vertical walls

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
They simply built a gate on the open side of the box canyon, and closed it when
  the animals were inside.
The five cliffs on either side of this box canyon provide popular rock climbing
  for even highly skilled technical climbers.
The property's box canyon is home to hundreds of species of wildlife and native
  plants, some of them rare and endangered.
The corral was situated at the head of a box canyon and supported by juniper
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