Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Fortress of Suomenlinna' has mentioned 'Sea' in the following places:
Occurrence Sentence Text Source
Sea fortress by Helsinki, Finland
Suomenlinna (Finnish; until 1918 Viapori), or Sveaborg (Swedish), is an inhabited sea fortress built on eight islands about 4xc2xa0km southeast of the city center of Helsinki, the capital of Finland.
Ehrensvxc3xa4rd's plan contained two fortifications: a sea fortress at Svartholm near the small town of Lovisa,[4] and a larger sea fortress and naval base (Sveaborg) at Helsingfors.
In addition to the island fortress itself, seafacing fortifications on the mainland would ensure that an enemy could not acquire a beach-head from which to stage attacks on the sea fort.
By cutting the coastal sea route past Hangxc3xb6, Russians prevented supplies from being shipped from Sweden to Sveaborg.
The importance of Sveaborg did not escape the Russians whose broad operational plan for 1790 included a siege of Sveaborg both from sea and land.
1914-1917: A ring of ground and sea fortifications, called Krepost Sveaborg, is built around Helsinki.
Suomenlinna (Sveaborg) is a sea fortress, which was built gradually from 1748 onwards on a group of islands belonging to the district of Helsinki.
The possibility of a sharp rise in sea levels owing to climate change constitutes a potential threat to the property, as it would accelerate the erosion of coastal structures.