Has your ship docked in Oslo and you want to get to know the city? Surely if you have come this far it is because you have a cruise along the Norwegian coast, however I propose to know some details of the fjord over which the capital of this kingdom is seen before you continue on your journey.
To begin with telling you that this Oslo fjord is not in the most geological sense a fjord, It stretches for about 150 km and connects the North Sea and the Baltic Sea. In it there are 40 islands, the largest is called Nøtterøy.
If you want to get to know the Oslo fjord well, I recommend a boat trip. Its landscape has nothing to do with what you will find later in the deep fjords, but it is about small heavily wooded hills with wooden houses, colorful bathing huts and ports for pleasure boats. This excursion lasts approximately 2 hours, so you have plenty of time to do other things in the city or simply to enjoy the boat on which you will continue your cruise. This is a generic excursion, on a panoramic boat, but also there are night excursions and private visits.
Another way to discover the Oslo fjords is through urban transport, yes with the Oslo Pass, You can get on and off all ships that sail between Rådhusbrygge 4, Hovedøya, Lindøya, Nakholmen, Bleikøya, Gressholmen and Langøyene. These lines are very popular in summer to go to the beach, hence some only work in summer. The line that operates all year round is the B1 line, which makes a circular and very frequent route through the islands of Hovedøya, Bleikøya, Gressholmen, Lindøya øst, Lindøya vest, Nakholmen, Hovedøya. Although the route is frequent, I recommend that you check the website or ask questions on your cruise to be sure that it is operational.
Surely your own cruise company will have proposed an excursion to the fjords of Oslo aboard boats smaller than the boat you are sailing on, don't miss the opportunity to discover that other way of sailing.
If you want to have more information about cruises to Norway I recommend that you read this article.