base level

base level

n.
The lowest level to which a land surface can be reduced by the action of running water.
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.

base level

n
(Physical Geography) the lowest level to which a land surface can be eroded by streams, which is, ultimately, sea level
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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