A dividing line between two places is usually called a border.
The Equator.
The dividing line between North and South America is typically considered to be the Panama-Colombia border. This is where the narrowest point of the Americas, known as the Isthmus of Panama, connects the two continents.
The 38th parallel is the dividing line between North and South Korea.
The 38th parallel
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.
The defining line was known as the Mason-Dixon line that starts at the southeastern tip of Pennsylvania.
The 17th parallel was established on 21 July 1954 as a provisional demarcation line.
the 38th parallel
Yangtze River
It is a parallel latitude Line it is the line that sepetates north and south
panama, belieze, and washinlaville.
The Yangtze River