FUSARO, LAGO, a lake of Campania, Italy, I m. west of Baiae, and i m. south of the acropolis of Cumae. It is the ancient Acherusia palus, separated from the sea on the west by a line of sandhills. It may have been the harbour of Cumae in early antiquity. In the 1st century A.D. an artificial outlet was dug for it at its south end, with a tunnel, under the hill of Torregaveta. This hill is covered with the remains of a large villa, which is almost certainly that of Servilius Vatia, described by Seneca. There are remains of other villas on the shores of the lake. Oyster cultivation is carried on there and there is a hydrobiological station in the former royal casino on an island in the lake.