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'Tyrifjorden' is Norway's fifth largest lake with an area of 137 km², has a volume of 13 km³, is 295 meters deep at its deepest, and lies 63 meters above sea level.
Sundvoldenbrua, the bridge at Sundvolden, parts Tyrifjorden from Steinsfjorden.
It is located in the county of Buskerud and borders the municipalities of Hole, Lier, Modum, and Ringerike.

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The name

The name

The Old Norse 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'' n 'old/dead pine (wood)'. (Referring specially to the woods of the western side of the lake.) The last element ''-fjorden'' (the finite form of fjord) is a later addition.