For all cities with a population greater than five hundred thousand, Kaesong is closest to Seoul and farthest from Mar del Plata. The closest foreign city is Seoul and the farthest domestic city is Chongjin. See below for the top 5 closest and farthest cities (domestically, internationally and by continent) and to see which cities, if any, Kaesong is the closest and farthest to. Filter to include all cities over 100k, 500k or 1 million in population.