[1] Small brooks and waterways divide the park area into smaller and larger islands.

Largest of the islands are Plaatansaari, Pakolansaari, Paratiisisaari, Kiikkusaari and Lasaretinsaari.

[1] The Northern Ostrobothnia museum has been located on the Pakolansaari island in the park since 1911.

The first museum building, a national romantic villa, was built in 1888, but it was destroyed in a fire in 1929.

University of Oulu Botanical Gardens were located on the Kiikkusaari island in the Hupisaaret park until 1983 before moving to the Linnanmaa campus.