Korean Demilitarized Zone

The Korean Demilitarized Zone is a strip of land running across the Korean Peninsula that serves as a buffer zone between North and South Korea. The DMZ cuts the Korean Peninsula roughly in half, crossing the 38th parallel on an acute angle, with the west end of the DMZ lying south of the parallel and the east end lying north of it. It is 248km/155 miles long and approximately 4km/2.5 miles wide, and is the most heavily armed border in the world.

en.wikipedia.org/wiki/Korean_Demilitarized_Zone