With suburbs 20), a walled city of N. Italy, of much historic interest both in ancient and mediæval times, on the small river Marecchia, spanned by a fine Roman bridge close to its entrance into the Adriatic, 69 m. SE. of Bologna; has a 15th-century Renaissance cathedral, an ancient castle, and other mediæval buildings, a Roman triumphal arch, &c.; manufactures silks and sail-cloth.