semi-caponier on popov island in peter the great bay of the sea of japan

ruins building village wall fortification waterway tree monastery transport house rock shack hut castle history cottage plant russia vladivostok primorye primorsky krai far east island popova strait starka coast line sea bay japanese peter great city district archipelago empress eugenia forest fortifications fortification military settlement structure defense soviet army frontier border concrete semi-caponier caponier protection tourism travel trail route