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Related to graben: rift valley
A usually elongated depression between geologic faults.
[German Graben, from Middle High German grabe, trench, from Old High German grabo, from graban, to dig; see ghrebh- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) an elongated trough of land produced by subsidence of the earth's crust between two faults
[C19: from German, from Old High German graban to dig]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a portion of the earth's crust, bounded on at least two sides by faults, that has dropped downward in relation to adjacent portions.
[1895–1900; < German: ditch]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.