The Boundary Line Between Two River Basins
This page is the CodyCross answer for the clue below from Canada, Group 1270, Puzzle 1 (Caesar Cocktail).
Question is: The Boundary Line Between Two River Basins
and the answer is: WATERSHED
Word Meaning:
WATERSHED — (hydrology, UK, Ireland, Australia, New Zealand) The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest.
Definitions from Wiktionary.