The underwater speed of sound was first measured in this body of water. The castle from 1989’s Little Mermaid was inspired by an island on this body of water. The longest non-stop rowing regatta in the world is on this body of water and references its Roman name of Lacus (20[1])Lemanus. A city on this body of water hosts the second-largest jazz festival in the world after (20[1])Montreal and was the site (0[1])of a casino fire that inspired Deep Purple’s song (*) “Smoke on the Water.” The Lavaux Vineyards overlook this body of water from Vaud. Mont Blanc is visible (10[1])from cities on this body of water like Montreux (“mon-TROO”). The department of Haute-Savoie (“oht sah-VWA”) shares this body of water with three cantons, including its namesake. For 10 points, name this large lake between France and Switzerland. (10[2])■END■