Comac'chio, a walled town of Italy, 30 miles ESE. of Ferrara, on an island in the east of the Valli di Comacchio, a shallow lagoon, about 90 miles in circumference, shut out from the Adriatic by a belt of land, 3 miles wide. It is a bishop's see, and has several fine churches. There are large salt-works and extensive fisheries, the fry of the eel and mullet being admitted to the lagoon in spring by canals opening to the sea, and exit after the fish are grown being prevented by nets and other contrivances, which are referred to both by
Tasso and Ariosto. Over 2,000,000 lb. of fish are caught annually. Pop. 7535.