Lansi Mustosaari and Kuivasaari islands

Sveaborg fortress has two defense lines from the seaside - actually Citadel with nearby islands and the outer perimeter, which was built in the eve of Great War. In the photo - Lansi Mustosaari (Strelkovy) island with its guns and ramparts and island of outer perimeter - famous Kuivasaari.
About Kuivasaari in detail see here.