Hobølelva is a river rising in
Sværsvann in
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 ...
, until joining Lake
Vansjø
Vansjø is a lake in the municipalities of Moss, Råde, Rygge, Våler in Østfold county, Norway.
Vansjø is part of Moss watershed (''Mossevassdraget'') stretching from Østmarka. Vansjø has four inflow rivers. The lake is fed by the Hobø ...
in
Østfold
Østfold is a traditional region, a former county and a current electoral district in southeastern Norway. It borders Akershus and southwestern Sweden (Västra Götaland County and Värmland), while Buskerud and Vestfold are on the other side ...
. Hobølelva is the largest of the four tributaries of Vansjø, and flows into Vansjø at an average of .
Rivers of Oslo
Rivers of Norway
{{Norway-river-stub