For all cities with a population greater than one million, Sullana is closest to Guayaquil and farthest from Medan. The closest foreign city is Guayaquil and the farthest domestic city is Lima. See below for the top 5 closest and farthest cities (domestically, internationally and by continent) and to see which cities, if any, Sullana is the closest and farthest to. Filter to include all cities over 100k, 500k or 1 million in population.