Definition of "thalweg" []

• Geology The line defining the lowest points along the length of a river bed or valley. (noun)
• Geology A subterranean stream. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "For those of you who don't know, a thalweg is the last remnants of water where a fish can survive when the water has receded."
• "Apparently, the border was agreed as being the 'thalweg' middle of the deep water channel to you & me at Algiers in 1975 but once you are out of the mouth of the Shatt-al-Arab there is no thalweg anymore."
• "Davidson also taught the group a few new definitions, "thalweg" being the favorite."