The Oslofjord (, ; ) is an inlet in southeastern
Norway
Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...
. The fjord begins at the small village of Bonn in
Frogn Municipality and stretching northwards to the city of
Oslo
Oslo ( or ; ) 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 1,064,235 in 2022 ...
, and then curving to the east and then south again. It then flows south to an imaginary line running between the
Torbjørnskjær Lighthouse
Torbjørnskjær Lighthouse (, ) is a fully automated coastal lighthouse situated on a skerry in the archipelago municipality of Hvaler, Norway. It marks the east side of the entrance to the Oslofjord, with Færder marking the west. The light is po ...
and
Færder Lighthouse where it becomes part of the
Skagerrak
The Skagerrak (; , , ) is a strait running between the North Jutlandic Island of Denmark, the east coast of Norway and the west coast of Sweden, connecting the North Sea and the Kattegat sea.
The Skagerrak contains some of the busiest shipping ...
strait. The Skagerrak connects the
North Sea
The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Se ...
and the
Kattegat
The Kattegat (; ; ) is a sea area bounded by the peninsula of Jutland in the west, the Danish straits islands of Denmark and the Baltic Sea to the south and the Swedish provinces of Bohuslän, Västergötland, Halland and Scania in Swede ...
sea area, which leads to the
Baltic Sea
The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the ...
. The Oslofjord is not a
fjord
In physical geography, a fjord (also spelled fiord in New Zealand English; ) is a long, narrow sea inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Antarctica, the Arctic, and surrounding landmasses of the n ...
in the geological sense, but in the
Norwegian language
Norwegian ( ) is a North Germanic language from the Indo-European language family spoken mainly in Norway, where it is an official language. Along with Swedish and Danish, Norwegian forms a dialect continuum of more or less mutually intelli ...
, the term can refer to a wide range of waterways including inlets such as this one.
The bay is divided into the inner () and
outer
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