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