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It is called a border.
grey line
it is for dividing
A boundary line is the dividing line between parcels of real property. It is sometimes a line that is surveyed according to the property's legal description, and sometimes the result of adverse possession (see link below).
This line is called the midpoint of the segment. It is located exactly halfway between the endpoints of the segment, dividing it into two equal segments.
The land area that supplies water to a river stream.I think this is incorrect:my understanding is that a drainage basin is somthing that supplies a river or stream, a water shed is a dividing line between drainage basins?
A dividing line between two places is usually called a border.
Continental Divide is the drainage that divides sea or ocean. The Great Divide or the Continental Divide of the Americas is the division of the Pacific Ocean watersheds from the Atlantic and Arctic.
A dividing line between two places is usually called a border.
Line Of Control
There is also a view as EurAsia is one continent and there is no dividing line between the two. In contrast if we look, the Ural Mountains in Russia could be a dividing line between Europe and Asia.
moho
border ..
The dividing line between North and South America is the Isthmus of Panama. It follows the Darius Mountains watershed divide.
Goloo
eurasia
The Equator.