Resava Cave or Resavska Cave is a cave near Jelovac in eastern Serbia, about 20 kilometres from Despotovac. It is one of the largest cave systems in Serbia, with the corridors about 4.5 kilometres long.
Wikipedia https://en.wikipedia.org/wiki/Resava_Cave
Address 385, Serbia
Coordinates 44°4'21.679" N 21°37'47.088" E