Suomenlinna, until 1918 Viapori (Finnish), or Sveaborg (Swedish), is an inhabited sea fortress built on six islands (Kustaanmiekka, Susisaari, Iso-Mustasaari, Pikku-Mustasaari, Länsi-Mustasaari and Långören), and which now forms part of the city of Helsinki, the capital of Finland.
Suomenlinna is a UNESCO World Heritage site and popular with both tourists and locals, who enjoy it as a picturesque picnic site. Originally named Sveaborg (Fortress of Svea), or Viapori as called by Finns, it was renamed Suomenlinna (Castle of Finland) in 1918 for patriotic and nationalistic reasons, though it is still also sometimes known by its original name. In Swedish-speaking contexts, the name Sveaborg is usually used.[1]