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Nowhere is the tension between North and South Korea more palpable than in the no-man's-land known as the Korean Demilitarized Zone, or DMZ. As a divided nation, only 2.5 miles (4 km) separate the North from the South at what is the most heavily armed border on earth. The 150-mile (241-km) zone has served as a buffer since the 1953 cease-fire agreement between the United Nations and North Korea that put the Korean War on hold.