Lake Geneva to swim at some beaches of the lake; indeed, visibility under water was near zero. By the 1980s, intense environmental pollution (eutrophication) had almost wiped out all the fish. Today, pollution levels have been dramatically cut back, and it is again considered safe to swim in the lake. Major leisure activities practiced include sailing, wind surfing, boating (including water skiing and wakeboarding), rowing, scuba diving and bathing. On a scientific footnote, in 1827, Lake Geneva was the site for the first measurement of the speed of sound in (fresh) water. French mathematician Jacques Charles François Sturm and Swiss Physicist Daniel
Geneva with other cities. It declares itself related to the entire world. Geneva has a population () of . The city of Geneva is at the centre of the Geneva metropolitan area, known as "Grand Genève" in French (Greater Geneva). Greater Geneva includes the Canton of Geneva in its entirety as well as the District of Nyon in the Canton of Vaud and several areas in the neighbouring French departments of Haute-Savoie and Ain. In 2011, the "agglomération franco-valdo-genevoise" had 915,000 inhabitants, two-thirds of whom lived on Swiss soil and one-third on French soil. The Geneva metropolitan area is experiencing steady