
1) Coastal fortification 2) Finnish island in the Baltic 3) Landmark in Finland
Found on
https://www.crosswordclues.com/clue/suomenlinna

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 tou...
Found on
http://en.wikipedia.org/wiki/Suomenlinna
No exact match found.