grey line
It is called a border.
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.
A dividing line between two places is usually called a border.
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.
The equator is the dividing line between the northern and southern hemispheres. It is an imaginary line that circles the Earth halfway between the North and South Poles.
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 ..
grey line
eurasia
The Equator.
It is called a border.
The geographical dividing line between the Tidewater and the Piedmont in Virginia is the Fall Line