-transform boundary
-convergent boundary
-subduction zoone
-divergent boundary
-mid-ocean ridge
-rift valley
...these are some possible answers to your question.
it is a frontier
It is usually called a border.
The longest land border between two countries is between Canada and the USA at 8891km.
The border between the Russian Federation and The Republic of Kazakhstan is 6846km.
It can be called a border, boundary or frontier. The line is not all that "imaginary" if you have passport or visa problems.
A boarder
Border.
The imaginary lines that run from north to south are called lines of longitude. The most significant one is the international date line, which divides the extreme east from the extreme west.
The Equator is an imaginary horizontal line of latitude. It is zero (0) latitude. It separates the Northern Hemisphere from the Southern Hemisphere.
My name is the Border of Tuesday and Wednesday. I separate the two days and provide an important delineation. I am the line between Tuesday and Wednesday. I divide the days so that they can be distinguished. I am the Border of Tuesday and Wednesday.
international date line and equator
Imaginary Line on the Earth that separte two cosective calender days.
That is usually known as the border.
A divide.
The Equator or Prime Meridian
Radcliffe line separates India and Pakistan
Spain and Portugal.
A line that separates two places is a boundary line.
Spain and Portugal
The imaginary lines that run from north to south are called lines of longitude. The most significant one is the international date line, which divides the extreme east from the extreme west.
the international date line sits on the 180 0 line of longitude in the middle of the Pacific Ocean , and is the imaginary line that separates two consecative calendar days
The Equator is an imaginary horizontal line of latitude. It is zero (0) latitude. It separates the Northern Hemisphere from the Southern Hemisphere.
the English Channel separates England from France.
The Bering Strait separates Russia and the US.