Italy's largest lake is Lake Garda, which is located in Northern Italy. It is the largest lake in the country and the largest in the Alps. It is also the deepest lake in Italy, with a maximum depth of 346 meters. The lake is surrounded by mountains and is a popular tourist destination, offering activities such as swimming, sailing, and windsurfing. It is also home to many species of fish, including trout, carp, and pike.