Lake Como (Lago di Como in Italian, also known as Lario) is a lake of glacial origin in Lombardy, Italy. It has an area of 146 km², making it the third largest lake in Italy, after Lake Garda and Lake Maggiore. At 410 metres deep, it is also one of the deepest lakes in Europe.
The lake has a very peculiar shape: that of an upside-down "Y". The northern branch begins at the town of Colico, while the towns of Como and Lecco sit at the ends of the southwestern and southeastern branches respectively. Lake Como is fed in large part by the Adda River, which enters the lake near Colico and flows out at Lecco. This geological conformation makes the southwestern branch a dead end, and so Como, unlike Lecco, is often flooded.