Formerly called just Ariano, it was built on three hills, and for that reason it is also known as Città del Tricolle (City of the Three Hills).
The municipality borders with Apice (BN), Castelfranco in Miscano (BN), Flumeri, Greci, Grottaminarda, Melito Irpino, Montecalvo Irpino, Monteleone di Puglia (FG), Savignano Irpino, Villanova del Battista and Zungoli [REF].