Tyrifjorden

Tyrifjorden
Tyrifjorden Location of Tyrifjorden in Buskerud Show map of Buskerud Tyrifjorden Tyrifjorden (Norway) Show map of Norway
Location	Buskerud, Norway
Coordinates	60°2′N 10°8′E / 60.033°N 10.133°E / 60.033; 10.133
Type	fjord lake
Primary inflows	Begna, Henåa, Skjærdalselva, Sogna and Storelva
Primary outflows	Drammenselva
Catchment area	9,898.81 km2 (3,821.95 sq mi)
Basin countries	Norway
Max. length	26 km (16 mi)
Max. width	10 km (6.2 mi)
Surface area	138.56 km2 (53.50 sq mi)
Average depth	95 m (312 ft)
Max. depth	295 m (968 ft)
Water volume	13.13 km3 (3.15 cu mi)
Shore length1	171.81 km (106.76 mi)
Surface elevation	63 m (207 ft)
Islands	Frognøya, Storøya, Utøya
Settlements	Hønefoss
References	[1]
Ramsar Wetland
Official name	Nordre Tyrifjord Wetlands System
Designated	18 March 1996
Reference no.	802[2]
1 Shore length is not a well-defined measure.

Tyrifjorden (Lake Tyri) is a lake in Norway. It lies 40 kilometres (25 mi) northwest of Oslo and is the nation's fifth largest lake with an area of 138.56 km².^[3] 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 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 river.