Castelmauro is a comune (municipality) in the Province of Campobasso in the Italian region Molise, located about north of Campobasso.

Castelmauro borders the following municipalities: Acquaviva Collecroce, Civitacampomarano, Guardialfiera, Montefalcone nel Sannio, Roccavivara, San Felice del Molise, Trivento.

In September 1884, the small village of Castelluccio Acquaborrana originated a resolution to change its ancient name to that of a new one.  Aside from Castelluccio (PG) itself, there have been a total of three such “Castelluccio” villages: 1) Acquaborrana, 2) Inferiore, and 3) Superiore.  Inferior and Superiore were located near Tursi (Province of Potenza).  

Acquaborrana was in Abruzzi-Molise, noted as “the loftiest village in the Apennines” having a population of 4,545 inhabitants and is situated on the southern east slope of Monte Mauro which has an elevation of 3,080 ft/ 939 m.  Only 35 years earlier, it had only half the number of inhabitants at 2,428. The official proclamation read:

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