Drainage divide

A drainage divide, water divide, divide, ridgeline, watershed, water parting, or (in Canada) height of land, is the line that separates neighbouring drainage basins. In hilly country, the divide lies along topographical ridges, and may be in the form of a single range of hills or mountains, known as a dividing range. In flat country—especially where the ground is marshy—the divide may be harder to discern.