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