Major drainage divides (red ridgelines) and drainage basins (green regions) in Europe. (Note the German labels.)
A drainage divide, water divide, divide, ridgeline,watershed, or water parting is the line that separates neighbouring drainage basins. On rugged land, the divide lies along topographicalridges, and may be in the form of a single range of hills or mountains, known as a dividing range. On flat terrain, especially where the ground is marshy, the divide may be harder to discern.
A valley floor divide is a low drainage divide that runs across a valley, sometimes created by deposition or stream capture.
Major drainage divide in which waters on each side of the divide never meet but flow into the same ocean, such as the divide between the Yellow River basin and the Yangtze. Another, more subtle, example is the Schuylkill-Lehigh divide at Pisgah Mountain in Pennsylvania in which two minor creeks divide to flow and grow east and west respectively joining the Lehigh River and Delaware River or the Susquehanna River and Potomac River, with each tributary complex having separate outlets into the Atlantic.
Minor drainage divide in which waters part but eventually rejoin at a river confluence, such as the Mississippi River and the Missouri River drainage divides.