Borøya is an
island
An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been ...
in the western section of
Oslofjord
The Oslofjord (, ; ) is an inlet in southeastern Norway. The fjord begins at the small village of Bonn in Frogn, Frogn Municipality and stretching northwards to the city of Oslo, and then curving to the east and then south again. It then flows s ...
(Vestfjorden), within the borders of the municipality of
Bærum
Bærum () is a list of municipalities of Norway, municipality in the Greater Oslo Region in Akershus County, Norway. It forms an affluent suburb of Oslo on the west coast of the city. Bærum is Norway's fifth largest municipality with a populatio ...
.
Islands of Akershus
Geography of Bærum
{{Norway-island-stub