Question

what is meant by water divide​

Answer 1

$\texttt\green{Any elevated area, such as a mountain}$

$\texttt\green{or an upland, separates two drainage basins.}$

$\texttt\green{Such an upland is known as a water divide.}$

Answer 2

water divide. Synonym English: drainage divide. Definition English: Water divide a.k.a. Drainage divide: A drainage divide, water divide, divide, ridgeline, watershed, water parting, or height of land, is the line that separates neighbouring drainage basins.