It is called a border.
grey line
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.
It is called a bisector.
If it's a fraction then it's the denominator which divides into the numerator
it is for dividing
Line Of Control
border ..
A dividing line between two places is usually called a border.
Borders
A dividing line between two places is usually called a border.
eurasia
d Berlin wall
The geographical dividing line between the Tidewater and the Piedmont in Virginia is the Fall Line
The line dividing illuminated areas from night areas is called the terminator.
A border
panama, belieze, and washinlaville.
The dividing line between the Atlantic and Pacific watersheds is called the Continental Divide. It begins at the Bering Strait and stretches to the Straight of Magellan. It is used to help designate the break between the Atlantic and Pacific Oceans.