Island ferry destinations include Hovedøya, Bleikøya, Lindøya, Gressholmen, Nakkholmen and Langøyene.
Departures: Island ferries depart from Rådhusbrygge 4 in front of Oslo City Hall.
For route information - see the Ruters website.
Guide to the islands and swimming beaches
The Agency for Urban Environment has prepared a tourguide to the islands (in Norewegian.
The agency also provides a guide to swimming beaches, that includes temperature and conditions (in Norwegian).