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Located under or at the base of a mountain or mountain range.
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.
1. (Physical Geography) situated on or characteristic of the lower slopes of a mountain
2. (Physical Geography) beneath a mountain or mountain range
[C19: from Latin sub- + mōns mountain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. under or beneath a mountain or mountains.
2. of or belonging to the lower slopes of mountains.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.