Sora is a town and comune of Lazio, Italy, in the province of Frosinone. It is built in a plain on the banks of the Liri. This part of the valley is the …Sora is a town and comune of Lazio, Italy, in the province of Frosinone. It is built in a plain on the banks of the Liri. This part of the valley is the seat of some important manufacturing, especially of paper mills. The area around Sora is famous for the costumes of its peasants.