Gjersjøelva (former Hvitebjørnselva) is a river in the municipality of

Oppegård Oppegård is an area in Nordre Follo, Viken, Norway. Oppegård was a municipality in the former county Akershus. It is part of the traditional region of Follo. The administrative centre of the municipality was the village of Kolbotn. The mu ...

Akershus Akershus () is a traditional region and current electoral district in Norway, with Oslo as its main city and traditional capital. It is named after the Akershus Fortress in Oslo. From the middle ages to 1919, Akershus was a fief and main county ...

county, Norway. It flows from

Gjersjøen Gjersjøen is a lake in the municipalities Oppegård and Ås in Akershus county, Norway. It has a surface area of , and is 40 m above sea level. The lake drains through Gjersjøelva to Bunnefjorden Bunnefjorden, sometimes referred to as Bunne F ...

and mouth into

Bunnefjorden Bunnefjorden, sometimes referred to as Bunne Fjord, is a part of the Oslofjord in south eastern Norway, located east of the Nesodden peninsula.https://snl.no/Bunnefjorden "en indre arm av Oslofjorden i Viken fylke. Fjorden .. skilt fra hovedfjorde ...

near Hvervenbukta, a total fall of . The last part of the river forms the border between Akershus and

Oslo Oslo ( , , or ; sma, Oslove) is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of in 2022, while the city's greater urban area had a population of ...

. Gjersjøelva had one of the first

saw mill A sawmill (saw mill, saw-mill) or lumber mill is a facility where logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes ( dimens ...

s in Norway, from the 16th century.

References

Rivers of Viken Oppegård Rivers of Norway {{Norway-river-stub