ALASA, or HALASA, (anc. geogr.) a town of Sicily, on the Tuscan sea, built, according to Diodorus Siculus, by Archonides of Herbita, in the second year of the ninety-fourth olympiad, or four hundred. dred and three years before Christ; situated on an emi- nence about a mile from the sea; now in ruins. It en- joyed immunity from taxes under the Romans, (Dio- dorus, Cicero.) The inhabitants were called Haliscini, (Cicero, Pliny;) also Alefiniti, and Alefiniti.