Niš (Serbian: Ниш / Niš, IPA: [niːʃ], listen (help·info)) is a city in Serbia situate at 43.3° N 21.9° E, on the river Nišava. With 250,000 inhabitants it is the largest city of South Serbia and third-largest city in the country, after Belgrade and Novi Sad. The city covers an area of about 597 square kilometres, including the city of Niš itself, the Niška Banja spa and 68 suburbs. Niš Constantine the Great Airport (Аеродром Константин Велики) is its international airport with the destination code INI. Niš is the administrative center of the Nišava District of Serbia.