SeeCastle
Fortress of Suomenlinna

Suomenlinna (Finnish: [ˈsuo̯menˌlinːɑ]), or Sveaborg (Swedish: [ˈsvɛːɑˈborj]), is a sea fortress composed of eight islands, of which six have been fortified. Located about four kilometres (2.5 mi) southeast of the city center of Helsinki, Finland, Suomenlinna is a popular destination for both tourists and locals, who enjoy it as a picturesque picnic site. Construction of the fortress began in 1748 under the Swedish Crown as a defense against Russia.
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- Heritage listed
Place data from OpenStreetMap, © OpenStreetMap contributors, ODbL.
Updated 29 Sept 2026. Something wrong? Tell us.