evidence: What is the DMZ? Map and pictures show the demilitarized zone Travis King crossed into North Korea [...] The DMZ is a 148-mile-long strip that incorporates territory from both North and South Korea. It is about 35 miles from South Korea's capital, Seoul, and runs along the 38th parallel, the line that divides the two countries, along which much of the Korean War occurred. The DMZ was created at the end of the Korean War in 1953, when an armistice was signed. Both countries are still divided and technically at war, but the DMZ ensures the demarcation between them remains peaceful. It is protected by heavily armed troops on both sides.