A boundary of watershed is defined by watershed divide. This is the ridge of uppermost elevation surrounding a stream or network of stream. Rainwaters that will fall outside of the boundary will enter different watershed and will flow to different bodies of water.
The term applied to the outside boundaries of a watershed is "MEANDER."
Geographical boundaries of a watershed can be identified by tracing the high points or ridgelines surrounding a particular area. Water within these boundaries will flow towards a common outlet, such as a river or lake, creating a distinct drainage basin. Maps and topographical features can help determine the boundaries of a watershed.
Look on the map of drainage divides. USGS
elevation features like hills, mountains, and ridges
Watershed.
Divides are the boundaries that separate streams in adjacent drainage basin.
It is an area of land that is drained by a river. It is also a ridge or elevated area of land that divides two areas of land that are drained by two river systems.
A watershed is an area of land where all the water drains into a common outlet, such as a stream, river, or lake. It is defined by the topography of the land, with higher elevations forming the boundaries of the watershed. The physical characteristics of a watershed can include its size, shape, slope, soil type, vegetation cover, and land use activities.
A watershed is also called a drainage basin. An example of a sentence using the word "watershed" is "The watershed north of the Laurentian Divide drains into Hudson Bay and the Arctic Ocean, whereas the watershed south of the Laurentian Divide drains into the Great Lakes and the Atlantic Ocean. "
A nested watershed is simply a watershed within a watershed. An example might be the Platte River watershed which is a nested watershed within the Missouri River watershed which in turn is nested within the Mississippi River watershed.
Pierre Richard T. Gravelle has written: 'Automatic delineation of watershed boundaries using IDRISI'
A divide is a topographic feature that separates watersheds by determining the direction in which water flows. It plays a crucial role in defining the boundaries of a watershed by directing water flow into respective drainage basins. Divides help to delineate the paths that water takes as it moves through the landscape and ultimately impacts the flow and quality of water within a watershed.