Ruotsinsalmi sea fortress

Ruotsinsalmi sea fortress (Swedish: Svensksund; both names meaning Swedish Strait) is a fortification system in Kotka, Finland. It is part of the South-Eastern Finland fortification system built by Russia after Russo-Swedish War of 1788-1790. Ruotsinsalmi sea fortress formed the southern part of a double fortress together with Kyminlinna and it was built to counter the Swedish sea fortresses of Svartholm in Loviisa and Sveaborg (Suomenlinna) in Helsinki. Ruotsinsalmi also acted as an outpost of the Kronstadt sea fortress in Saint Petersburg. During the Crimean War, a British-French fleet destroyed the Ruotsinsalmi fortifications in 1855.

"Ruotsinsalmi" redirects here. For the Ruotsinsalmi-class minelayer, see Finnish minelayer Ruotsinsalmi.
Fort Slava in Kukouri island
Ruins of Fort Katarina

Ruotsinsalmi sea fortress is composed of a number of separate forts, redoubts, and artillery batteries. The main fortress was the Fort Katarina located on the southern part of Kotkansaari island in the present-day Katariina neighbourhood. Other larger forts were Fort Elisabeth in Varissaari island and Fort Slava in Kukouri island. Remnants of smaller forts can also be found, for example, in Tiutinen island.

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