38th Parallel:

The 38th parallel is a circle of latitude 38 degrees north of the equatorial plane.

The 38th parallel is a circle of latitude 38 degrees north of the equatorial plane.
This line divides the Korean peninsula roughly in half (leaving about 56% of Korean territory on the northern side).
38th parallel, popular name given to latitude 38° N that in East Asia roughly demarcates North Korea and South Korea.
The line was chosen by U.S. military planners at the Potsdam Conference (July 1945) near the end of World War II as an army boundary, north of which the U.S.S.R
The actual border between North and South Korea slants across this circle of latitude, finishing some distance north of it on the east coast.