The DMZ, or demilitarized zone, is the boundary area between North and South Korea. It is considered a cease-fire zone. While travelers can visit the DMZ, not all areas of the zone are safe. Only a small portion of the DMZ, known as the JSA or Joint Security Area, is open to the public. In the JSA, you can physically stand in North Korea, although you will be within a building that also houses South Korean soldiers.