Castello di Annone borders the following municipalities: Asti, Cerro Tanaro, Quattordio, Refrancore, Rocca d'Arazzo, and Rocchetta Tanaro. Its name derives from the Latin ad nonum ("nine miles"), indicating its distance from Asti.
Castello di Annone is situated near the following towns: Asti, Cerro Tanaro, Quattordio, Refrancore, Rocca d'Arazzo, and Rocchetta Tanaro. Its name comes from the Latin phrase "ad nonum," meaning it is nine miles away from Asti.