Landmarks of Katajanokka include the Russian Orthodox Cathedral, also known as Uspenski Cathedral (architect Alexey Gornostaev, 1868), the Merikasarmi complex of the Foreign Ministry (architect Carl Ludvig Engel, 1825) and the Finnish headquarters of Stora Enso (architect Alvar Aalto, 1962; the most controversial of Aalto's works).
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Katajanokka's residents include former Finnish President (from 1982 to 1994) Mauno Koivisto and composer Einojuhani Rautavaara.
As a result the existing icebreakers had an effective operational time of only three to five months per year and spent the summer season moored at Katajanokka in Helsinki.
In the scene where the camera shifts to Katajanokka seen from the Helsinki Market Square, the Norrmén house by Theodor Höijer is seen in the place of the Enso-Gutzeit main office by Alvar Aalto that is actually situated there.
The suburb is positioned between two lakes, Hosjön and Runn, and can also be subdivided into different areas, such as Hosjöstrand, Backberget, Central Hosjö, Uddnas, Karlslund, Skutudden, and Hosjöholmen.