.mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}@media all and (max-width:500px){.mw-parser-output .hidden-begin{width:auto!important;clear:none!important;float:none!important))You can help expand this article with text translated from the corresponding article in Finnish. (June 2023) Click [show] for important translation instructions.
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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.
