For 10 points, name this heavily-mined strip of land that crosses the 38th Parallel and serves as a buffer between North and South Korea.
Operation Paul Bunyan was a response to an event here that began with an attempt to trim a poplar tree and ended in a brutal axe murder. An inability to locate this region led to the capture of most of the participants in the Blue House Raid, while Operation Big Switch was conducted in this area, specifically over the Bridge of No Return, which lies near the world's largest flagpole. Four "Tunnels of Aggression" beneath this area have been unearthed, and its Joint Security Area lies near the site of a famous armistice, Panmunjeom. For 10 points, name this heavily-mined strip of land that crosses the 38th Parallel and serves as a buffer between North and South Korea.
Operation Paul Bunyan was a response to an event here that began with an attempt to trim a poplar tree and ended in a brutal axe murder.
Korean {Demilitarized Zone} [or {DMZ}; accept {Joint Security Area} before mentioned, prompt on things like {Korean Border}]