Lake Como
Lake Como was a lake in Italy on Earth.
In 2373, Tom Paris had a holoprogram called Sailing on Lake Como which he suggested to B'Elanna Torres in case she ever had a free evening, but she refused, stating that she'd rather take her chances with Freddy Bristow. (VOY: "The Swarm")
According to the Star Trek Encyclopedia, 4th ed., vol. 1, p. 452, this lake, located near the community of Como in northern Italy, was about fifty kilometers long.