 thumb|map of oslofjord the oslofjord () is an inlet in the south-east of norway, stretching from an imaginary line between the torbjÃ¸rnskjÃ¦r and fÃ¦rder lighthouses and down to langesund in the south to oslo in the north. it is part of the skagerrak strait, connecting the north sea and the kattegat sea area, which leads to the baltic sea. the oslofjord is not a fjord in the geological sense - in norwegian the term "fjord" can refer to a wide range of waterways. the bay is divided into the inner (indre) and outer (ytre) oslofjord at the point of the 17&nbsp;km long and 1 km wide drÃ¸bak sound. thumb|summer houses in the oslofjord ==population== the entire population situated around the oslofjord including oslo is about 1.96 million, and the total population of all the counties situated around the fjord is approximately 2,2 million. ==islands== each of the islands in the innermost part of the fjord has its own identity and distinguishing history. among them are hovedÃ¸ya, lindÃ¸ya, nakholmen, bleikÃ¸ya, gressholmen, and langÃ¸yene. these islands can easily be reached with the oslo-boats from vippetangen. hovedÃ¸ya is most famous for its monastery ruins, gressholmen for its rabbits, nakholmen, bleikÃ¸ya, lindÃ¸ya for their cosy cabins at the waterâs edge, and finally langÃ¸yene for its camping possibilities and pleasant beach. ==recreation== in the summer there are boats of all sizes on the fjord, and it is possible to go kayaking, canoeing, fishing, and sailing. there are many activities for both adults and children. ==history== the oldest settlements in the area surrounding the oslofjord date from the stone age and the bronze age. it was here on the eastern and western shores that three of the best preserved viking ships were unearthed. in historical times, this bay was known by the current name of the region, viken (the bay). oslofjord has been an important body of water strategically due to its proximity to oslo. during wwii, there were german installations at several points on its coastline. one installation in hovedÃ¸ya held 1,100 wehrmacht soldiers and later women deemed nazi collaborators at the national internment camp for women in hovedÃ¸ya. norwegian painter edvard munch had a cottage and studio in ÃsgÃ¥rdstrand on the fjord and the oslofjord appears in several of his paintings, including the scream and girls on the pier. ==second world war== thumb|german cruiser blÃ¼cher the fjord was the scene of a key event in the german invasion of norway in april 1940, the battle of drÃ¸bak sound. the invasion included a planned landing of 1,000
Oslofjord