Arce is a comune in the province of Frosinone, in the region of Lazio, Italy. it is an agricultural centre located on a hill overlooking the Via Casilina, in the Latin Valley and in the middle valley of the Liri. Arce borders with the municipalities of Ceprano, Colfelice, Falvaterra, Fontana Liri, Monte San Giovanni Campano, Rocca d'Arce, San Giovanni Incarico and Strangolagalli.