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Krepost Sveaborg - Wikipedia, the free encyclopedia - http://en.wikipedia.org/wiki/Krepost_Sveaborg
"The Krepost Sveaborg was an Imperial Russian system of land and coastal fortifications constructed around Helsinki during First World War. The purpose of the fortress was to provide a secure naval base for the Russian Baltic fleet and to protect Helsinki and block routes to Saint Petersburg from a possible German invasion. Krepost Sveaborg was part of the Peter the Great's Naval Fortress, a coastal fortification system protecting access to Saint Petersburg by sea." ‎- silpol