Title: Крестовский, Елагин, Петровский
Subjects: History, Islands, Description and travel, Travel
Places: Petrovskiĭ ostrov (Saint Petersburg, Russia), Elagin ostrov (Saint Petersburg, Russia), Krestovskiĭ ostrov (Saint Petersburg, Russia), Russia (Federation), Saint Petersburg, Saint Petersburg (Russia), Elagin ostrov, Krestovskiĭ ostrov