With rocket assisted projectiles (RAP), North Korea's Koksan self propelled guns have a demonstrated range of 37 miles. Note that this is based on the performan

With rocket assisted projectiles (RAP), North Korea's Koksan self propelled guns have a demonstrated range of 37 miles. Note that this is based on the performance of the guns observed during the Iran-Iraq war, and it is entirely possible that further improvements to range have been made in the past 30 years. Also, it's 35 miles from the DMZ to the center of Seoul, but Seoul is a big city. There are parts of Seoul proper less than 25 miles from the DMZ, and the metropolitan area extends much closer still. Hundreds of thousands of people in South Korea live within comfortable artillery range of North Korea.