ACHERUSIA PALUS, a lake between Cumæ and the promontory Misenum, now il Lago della Coluccia, (Cluverius.) Some confound it with the Lacus Lærinus, and others with the Lacus Avernus. But Strabo and Pliny distinguish them. The former takes it to be an effusion, exundation, or washes of the sea, and therefore called by Lycophon, Ἀχερνικὴ λίμνη.—Also a lake of Epirus, through which the Acheron runs.—There is also an Acherusia, a peninsula of Bithynia on the Euxine, near Heraclea; and a cave there of the same name, through which Hercules is fabled to have descended to hell to drag forth Cerberus.