There are many such lines, they are called lines of longitude.
The Equator - the line that rounds around the middle of the Earth - the halfway mark between the North and South Poles.
Every meridian of longitude in the range of roughly 34.8°W -- 81.3°W
crosses part of South America.
Answer: the Demarcation Line
== == The line of demarcation
because tedy bears are big.
the line of demarcation
In the globe it is called the axis. In a sphere it is called the diameter.
Axis
The Demarcation Line was an imaginary line passing through the continent of South America. It was drawn by Pope Alexander VI to divide the new lands conquered by Portugal from those of Spain.
They are called the Arctic Circle and the Antarctic Circle.
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It's called the normal.
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normal.
You're talking about the Prime Meridian ... the imaginary line that defines the origin of longitude on Earth.But issue must be taken with your use of the terms "from" and "to". No meridian, including the Prime one, has a defined beginning or end point. They simply join the poles.
The imaginary line was the Line of Demarcation drawn according to the Treaty of Tordesillas in 1494. It was designed to prevent Spain and Portugal from claiming the same regions and establishing competing colonies in the world, notably the New World. The line was a line of longitude around 42.5° W, about midway between the Portuguese colony in the Cape Verde Islands and the new Spanish possessions in Hispaniola and the Caribbean. The line effectively limited Portugal to a major colony in Brazil, the only modern South American country that extends east of the line.