Lake Lucerne

Lake Lucerne (German: Vierwaldstättersee, literally 'Lake of the four forested settlements' (in English usually translated as forest cantons); French: lac des Quatre-Cantons; Italian: lago dei Quattro Cantoni) is a lake in central Switzerland and the fourth largest in the country.

The name of Vierwaldstättersee is first used in the 16th century. Before the 16th century, the entire lake was known as Luzerner See "Lake Lucerne", as remains the English (and partly Italian, as Lago di Lucerna) usage. The (three) "Waldstätte(n)" (lit.: "forested sites/settlements", in English usually translated as forest cantons) since the 14th century were the confederate allies of Uri, Schwyz and Unterwalden. The notion of "Four Waldstätten" (Vier Waldstätten), with the addition of the canton of Lucerne, is first recorded in the 1450s, in an addition to the "Silver Book" of Egloff Etterlin of Lucerne.

Archaeologists surveying the lake-bed (during the construction of a pipeline) from 2019 to 2021 found the remains of a Bronze Age village with artifacts dating to around 1000 BC. Later, the new findings indicated that the area was settled 2,000 years earlier than historians previously thought.

The Swiss Armed Forces historically used Lake Lucerne as a dumping ground for old munitions, with an estimated 3,300 tonnes of munitions currently submerged in the lake. The Swiss Defence Department has offered a prize of 50,000 francs (£45,000) for the best proposal to safely remove the munitions.

The lake has a complicated shape, with several sharp bends and four arms. The nine different parts of the lake have individual designations:

Lake Lucerne starts in the south–north bound Reuss Valley between steep cliffs above the Urnersee from Flüelen towards Brunnen to the north before it makes a sharp bend to the west where it continues into the Gersauer Becken. Here is also the deepest point of the lake with 214 m (702 ft). Even further west of it is the Buochser Bucht, but the lake sharply turns north again through the narrow opening between the Unter Nas (lower nose) of the Bürgenstock to the west and the Ober Nas (upper nose) of the Rigi to the east to reach the Vitznauer Bucht. In front of Vitznau below the Rigi the lake turns sharply west again to reach the center of a four-arm cross, called the Chrütztrichter (Cross Funnel). Here converge the Vitznauer Bucht with the Küssnachtersee from the north, the Luzernersee from the west, and the Horwer Bucht and the Stanser Trichter to the south, which is to be found right below the northeast side of the Pilatus and the west side of the Bürgenstock. At the very narrow pass between the east dropper of the Pilatus (called Lopper) and Stansstad the lake reaches its southwestern arm at Alpnachstad on the steep southern foothills of the Pilatus, the Alpnachersee. The lake drains its water into the Reuss in Lucerne from its arm called Luzernersee (which literally translates as Lake of Lucerne).

The entire lake has a total area of 114 km² (44 sq mi) at an elevation of 434 m (1,424 ft) a.s.l., and a maximum depth of 214 m (702 ft). Its volume is 11.8 km³. Much of the shoreline rises steeply into mountains up to 1,500 m above the lake, resulting in many picturesque views including those of the mountains Rigi and Pilatus.

The Reuss enters the lake at Flüelen, in the part called Urnersee (Lake of Uri, in the canton of Uri) and exits at Lucerne. The lake also receives the Muota at Brunnen, the Engelberger Aa at Buochs, and the Sarner Aa at Alpnachstad.