ALALIA, or ALARIA, (anc. geogr.) a town of Corica, situated near the middle of the east side of the island, on an eminence, near the mouth of the river Rotanus mentioned by Ptolemy; built by the Phoenicians, (Diodorus Siculus.) Afterwards Sylla led a colony thither. It is now in ruins, and called Aleria Diffusa.