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