|Location||Canton of Berne|
|Primary inflows||Aare, Lütschine|
|Catchment area||1,127 km²|
|Max. length||14 km|
|Max. width||2.8 km|
|Surface area||29.8 km²|
|Average depth||173 m|
|Max. depth||260 m|
|Water volume||5.17 km³|
|Residence time||2.69 years|
|Surface elevation||564 m|
|Settlements||Bönigen, Brienz, Iseltwald, Niederried, Oberried, Ringgenberg|
Lake Brienz (German: Brienzersee) is a lake just north of the Alps, in the Canton of Berne in Switzerland. It has a length of about 14 kilometres (8.7 mi), a width of 2.8 kilometres (1.7 mi) and a maximum depth of 260 metres (850 ft). Its area is 29.8 square kilometres (11.5 sq mi), and the surface is 564 metres (1,850 ft) above the sea-level. It is fed by the upper reaches of the Aar river at its eastern end and by the Lütschine river, flowing from the valleys of Grindelwald and Lauterbrunnen, at its south-western corner. It flows out into a further stretch of the Aar river at its western end. The culminating point of the lake's drainage basin is the Finsteraarhorn at 4,274 metres above sea level.
The village of Brienz, from which the lake takes its name, lies to its eastern end. In the west the lake is terminated by the Bödeli, a tongue of land that separates it from neighbouring Lake Thun. The village of Bönigen occupies the lake frontage of the Bödeli, whilst the larger resort town of Interlaken lies on the reach of the Aar river between the two lakes. The village of Iseltwald lies on the south shore, whilst the villages of Ringgenberg, Niederried and Oberried are on the north shore.
The lake is poor in nutritients, and consequently fishing is not very important. Nevertheless, in 2001 10,000 kg fish were caught.
There have been passenger ships on the lake since 1839, and currently there are five passenger ships on the lake. The ships are operated by BLS AG, the local railway company, and link Interlaken Ost railway station, which they access using a 1.3-kilometre (0.81 mi) long navigable stretch of the Aar river, with Brienz and other lakeside settlements. The ships also connect to the Giessbachbahn funicular, which climbs up to the famous Giessbach Falls.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.
- "Lake Brienz". MySwitzerland.com. Switzerland Tourism. Retrieved 2013-01-03.
- 1:25,000 topographic map (Map). Swisstopo. Retrieved 2014-07-28.
- "History of navigation on Lakes Thun and Brienz". BLS AG. Retrieved 2012-12-13.
- "BLS Schiffahrt - Our fleet". BLS AG. Retrieved 2012-12-13.
- Media related to Lake Brienz at Wikimedia Commons
- Shipping pages from BLS AG web site
- Lake Brienz in German, French and Italian in the online Historical Dictionary of Switzerland.
- Ökosystem Brienzersee (German) interdisciplinary study of the ecosystem
- Waterlevels at Ringgenberg from the Swiss Federal Office for the Environment