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thalweg noun

  /ˈtaːlvɛç/ , /ˈtɑl.vɛɡ/ , /ˈtɑːlvɛɡ/ , /ˈθɑːlwɛɡ/
  • (geology, geography, cartography) The line that connects the lowest points in a valley or river channel, and thus the line of fastest flow or deepest water along a river’s course.
 tàlveg
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