Tyrifjorden (Lake Tyri) is a lake in

Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and th ...

. It lies northwest of Oslo and is the nation's fifth largest lake with an area of 139 km². It has a volume of 13 km³, is 295 meters deep at its deepest, and lies 63 meters above sea level. The lake's primary source is the Begna river, which discharges into Tyrifjorden at

Hønefoss __NOTOC__ Hønefoss is a town and the administrative center of the municipality of Ringerike in Buskerud county, Norway. Hønefoss is an industrial center of inner Østlandet, containing several factories and other industry. As of 1 January 2008 ...

where the river forms the waterfall of Hønefossen. Its primary outlet is at Vikersund near the lake's southwest corner, where Tyrifjorden discharges into the

Drammenselva Drammenselva ( en, Drammen River) is a river in Buskerud county, southeastern Norway. Location Drammenselva is one of the largest rivers in Norway, with a drainage basin of about and a discharge of per second. Drammen River's total length i ...

river.

Location

Tyrifjorden is located in the county of Viken and borders the municipalities of

Hole A hole is an opening in or through a particular medium, usually a solid body. Holes occur through natural and artificial processes, and may be useful for various purposes, or may represent a problem needing to be addressed in many fields of en ...

, Lier,

Modum Modum is a municipality in Buskerud in Viken county, Norway. The administrative centre of the municipality is the town of Vikersund. The municipality of Modum was established on 1 January 1838 (see formannskapsdistrikt). The area has a long t ...

, and Ringerike. Tyrifjorden is a landlocked

fjord In physical geography, a fjord or fiord () is a long, narrow inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Alaska, Antarctica, British Columbia, Chile, Denmark, Germany, Greenland, the Faroe Islands, Icel ...

. It consists of a main body, Storfjorden, along with the Holsfjorden, Nordfjorden, and Steinsfjorden branches.

Branches

*Nordfjorden – This is the northernmost fjord arm of Tyrifjorden * Steinsfjorden – This is the northeastern arm of Tyrifjorden *Holsfjorden – This is the southeastern arm as well as being the longest and largest of the fjord branches

Islands

* Utøya – camp site for events *Storøya – with a golf club *Frognøya

The name

The

Old Norse Old Norse, Old Nordic, or Old Scandinavian, is a stage of development of North Germanic dialects before their final divergence into separate Nordic languages. Old Norse was spoken by inhabitants of Scandinavia and their overseas settlement ...

form of the name was just ''Tyri'' (or ''Tyrvi''). This uncompounded name is also the first element in the name Tyristrand. The name is derived from the word ''tyri'' meaning "old/dead

pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts ...

(wood)", referring specifically to the woods of the western side of the lake. The last element ''-fjorden'' (the finite form of

) is a later addition.

2011 shooting massacre

On 22 July 2011, an island in the lake, Utøya, was the site of a shooting spree during a youth camp held by the

Norwegian Labour Party The Labour Party ( nb, Arbeiderpartiet; nn, Arbeidarpartiet; A/Ap; se, Bargiidbellodat), formerly The Norwegian Labour Party ( no, Det norske Arbeiderparti, DNA), is a social-democratic political party in Norway. It is positioned on the cent ...

References

External links

Moonlight at TyrifjordenFrost Mist Over Lake Tyrifjorden
Lakes of Viken (county) Lier, Norway Ramsar sites in Norway {{Viken-geo-stub