Lake Geneva

The first recorded name of the lake is Lacus Lemannus, dating from Roman times; Lemannus comes from Ancient Greek Liménos Límnē meaning "port's lake"; it became Lacus Lausonius, although this name was also used for a town or district on the lake, Lacus Losanetes, and then the Lac de Lausanne in the Middle Ages. Following the rise of Geneva it became Lac de Genève(translated into English as Lake Geneva). In the 18th century, Lac Léman was revived in French and is the customary name in that language. In contemporary English, the name Lake Geneva is predominant.

According to the Swiss Federal Office of Topography, swisstopo, Lac de Genève designates that part of the Petit Lac, which lies within the cantonal borders of Geneva (excluding the cantonal exclave Céligny), so about from Versoix - Hermance to the Rhône outflow in Geneva.
The Chablais Alps border is its southern shore, the western Bernese Alps lie over its eastern side. The high summits of Grand Combin and Mont Blanc are visible from some places. Compagnie Générale de Navigation sur le lac Léman (CGN) operates boats on the lake.

In 563, according to the writings of Gregory of Tours and Marius Aventicensis, a tsunami wave swept along the lake, destroying the fort of Tauredunum and other settlements, and causing numerous deaths in Geneva. Simulations indicate that the Tauredunum event was most likely caused by a massive landslide near the Rhône delta, which caused a wave eight metres (26 ft) high to reach within 70 minutes. In 888 the town was part of the new Kingdom of Burgundy, and, with it, was absorbed into the Holy Roman Empire in 1033.
In the late 1960s, pollution made it dangerous 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 wake-boarding), rowing, scuba diving and bathing.
A total of four submarines have plied the depths of Lake Geneva. In 1964, Jacques Piccard launched a tourist-oriented submarine, the Auguste Piccard (named for his explorer father), for the Swiss National Exhibition, meant to honor the Expo 64 theme of accomplishments by Swiss engineers and industry. After operating through to 1965 in Lake Geneva, Picard used the vessel for scientific exploration in other parts of the world. Picard later built the F.-A. Forel, launched in Lake Geneva in 1978 and used primarily for scientific research until it was retired in 2005. In 2011, in a collaborative operation led by École Polytechnique Fédérale de Lausanne, two Mir submersibles were used for ten weeks to conduct extensive scientific research in Lake Geneva.
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 Collodon used two moored boats, separated by a measured distance, as the transmit and receive platforms for the sounds of exploding gunpowder. The loud airborne sound coupled into the lake, establishing a loud underwater sound that could be measured at a distance. The flash of the exploding gunpowder provided the visual starting cue for the timepiece, and the underwater explosion sound striking a bell provided the finish cue.
The lake is rich in wildlife, especially birds: both the common buzzard and the red kite breed here in considerable numbers.