the line on the map that marks the border between North Korea and South Korea, established in 1945 after the Second World War. When US troops crossed it during the Korean War in 1950 this caused the Chinese to enter the war. It was again used as the border when peace was signed in 1953.
مدار ۳۸ درجه, مدار ۳۸ام, مدار شمالی ۳۸