Wikipedia has a map [0] which shows the extent of the ancient lake (Lago Valino) the Romans drained (the waterfall is in the upper left corner). This lake had a

Wikipedia has a map [0] which shows the extent of the ancient lake (Lago Valino) the Romans drained (the waterfall is in the upper left corner). This lake had a surface area of around 90 km², which is roughly half the size of present-day Lago Maggiore. [0] https://upload.wikimedia.org/wikipedia/commons/c/cc/Anticolagovelino.jpg https://upload.wikimedia.org/wikipedia/commons/c/cc/Anticola...