Como, Lake (kōˈmō) [key], Ital. Lago di Como or Lario, c.56 sq mi (145 sq km), 30 mi (48 km) long and from 1/2 to 21/2 mi (0.8–4 km) wide, in Lombardy, N Italy. Lake Como is a natural widening of the Adda River, which feeds and drains the lake. Situated in the foothills of the Alps, the lake is one of the most beautiful of Europe. It is a tourist resort, and handsome villas line its shores. Lecco, Como, Varennes, and Bellagio are principal towns.