Destination information

The best landing place is the surface rock on the northern edge of the area. Visitors should note the boulders in the water. The area’s information board, campfire site, and dry toilet are all close to the landing site. It is also possible to land small boats on the southern end of the island.

There are many boat ramps on the mainland not far from Onas, for example in Sipoo Kalkkiranta and Spjutsund. To the west of Onas lies the Kaivokari outdoor recreation area and a harbour owned by the City of Helsinki.


Onas is not an easily accessible destination due to rough terrain at the landing sites and the area’s topography.

Additional information

The Nikuviken recreation area owned by Kerava city is only 11 kilometres from Onas. There is also another Uuvi recreation area close by — Stornässudden in Emäsalo is approximately 20 kilometres from Onas.

The Onas archipelago boasts a lot of heritage landscapes and buildings, and relic sites like troy towns. There are also several wooden shipwrecks underwater. The relic sites are protected by law. Rönnskär island (2 hectares) and its waterway beacon built in 1905 are also part of the Uuvi recreation area.