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.
A dividing line between two places is usually called a border.
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.
That would be a circle composed of two semi-circles: One is the Prime Meridian, the other is the meridian of 180° longitude, directly opposite the Prime Meridian. Each of them connects the north and south poles.
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Yangtze River
The 17th parallel was established on 21 July 1954 as a provisional demarcation line.
The equator is a line of latitude that circles the Earth at 0 degrees. It is halfway between the North and South Poles, dividing the Earth into the Northern and Southern Hemispheres.
the 38th parallel
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