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Tyrifjorden or Lake Tyri, which in English translates as Lake Resinous, is the fifth biggest lake in all of Norway. It´s not a very big lake, compared to international standards, but approximately 137 sq. kilometers in size. The water surface is 63 meters above the sea level today, which millenniums ago stood some 68 meters higher and made it a part of the sea.

The lake´s primary source is the Begna river, which discharges into Tyrifjorden at Hønefoss where the river forms the Hønefossen waterfall. Its primary outlet is at Geithus near the lake´s southwest corner, where Tyrifjorden discharges into the Drammenselva river.

Tyrifjorden it´s one of the most beautiful and diverse lakes in all of Norway and a very popular place for recreation amongst the population in the district. Boating, swimming, sun bathing, fishing and bird watching is nothing but a few keywords that connects. The lake is surrounded by steep hills, which stretches towards some of the most beautiful recreation terrain in all of Norway. This terrain is over grown by Spruce-fir today, but this has not always been the case.

Utøya is an island in Tyrifjorden. The island is 10.6 hectares and situated 500 metres off the shore, where road E16 passes by, 38 km driving distance north-west of Oslo.

Tyrifjorden is located in the county of Buskerud and borders the municipalities of Hole, Lier, Modum, and Ringerike.

The lake is separated in four parts by the nature, called Steinsfjorden, Nordfjorden, Holsfjorden and Tyrifjorden, but their common name is Tyrifjorden. The average depth of the main plateau, which is the central middle part of the lake, is 286 meters.

The deepest part of it, however, is more than 330 meters. This part is the middle section of Holsfjorden. The most shallow parts are the eastern parts of Nordfjorden and Steinsfjorden, who has an average depth of less than 20 meters and scattered by small cozy islands.

The main water supply is the river Grand (Storelva), which is a joint river that blend from the two rivers Begna and Randselva almost in the middle of Hønefoss Town, a few kilometers north of the lake. This and the river Sogna both joins the lake at the sandy beaches on the northeastern shores of Nordfjorden.

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