swedish low small island archipelago finland belongs municipality situated kilometres south baltic sea main island measures hectares acres area rock sea cliffs rocky shores found coastline island breeding ground status frequented use lighthouse buildings stay ferry routes pass kilometres including ferry stockholm ferry ferry ferry past vessels sunk coast history earliest island linked wooden beacon existed island 1840s lighthouse constructed replace beacon inhabitants comprising families lighthouse keepers addition livestock fishing hunting wildlife families ran school children lighthouse society functioned time wooden lighthouse stone structure destroyed world war existing lighthouse built introduced rotating gas lighting device noted kind world lighthouse automated lighthouse keepers vacated island april german nassau class battleship ran aground heavy fog world war german vessel sprang leak sank crew survived evening october finnish submarine torpedoed sank soviet class submarine near geography island comprises mix rocky areas vegetation centre rock sea cliffs rocky shores found coastline small sandy beach north west near island particularly south rocky rocks including east identified island wetland middle basins measuring metres width situated separates basins nature wildlife area measuring hectares acres size islands area measuring hectares acres size recognized designation hectares acres overlaps site occasionally visited operate bird ringing station established use abandoned buildings stay island identified finnish magazine important breeding bird islands island key bird species breeding species recorded mute swan duck black water rail colonies white tailed eagle despite harsh conditions vegetation island fairly diverse following island grazing ban vegetation thick resulted breeding ground large reed bed small area fish species reported late 19th century small rock pool metres size continue flourish lengths varying centimetres found coastline study species recorded depths varying metres species reported include followed lesser number previous 1950s study
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