The bay is divided into the inner (indre) and outer (ytre) Oslofjord at the point of the 17 km long and narrow Drobaksundet. The entire population situated around the Oslofjord including Oslo is about 1.7 million, and the total population of all the counties situated around the fjord is approxiametely 2 million.

In spite of its name, the Oslofjord is not, geologically speaking, a fjord. In historical times, it was known by the current name of the region, Viken (the bay); it is unclear when (and for what reason) the body of water acquired its current name.

Norwegian painter Edvard Munch had a cottage and studio in Asgardstrand on the fjord and it appears in several of his paintings, including The Scream and Girls on the Pier.

The Oslofjord is one of the nine venues of the Class 1 World Powerboat Championship.

Wikipedia articles for Oslofjord

• Oslofjord
• Bastøy Prison
• List of lighthouses in Norway
• Larkollen