Where is Ostrov?

Ostrov - Klyukov Moh Ostrov - Voronovku Ostrov - Parafievku Ostrov - Chasnikovku Ostrov - Zheleznodorozhnuyu Stanciyu Bahmach Tovarnyi Ostrov - Zheleznodorozhnuyu Stanciyu Bahmach Kievskii Ostrov - Shinkovschinu Ostrov - Obuhovo Ostrov - Cherevki Ostrov - Zayaruzhe Ostrov - Kotovku Ostrov - Bernovichi Ostrov - Zheleznodorozhnuyu Stanciyu Kuren Ostrov - Zheleznodorozhnuyu Stanciyu Cheremushki Ostrov - Koshmalov Ostrov - Ivanovku Ostrov - Peski Ostrov - Zheleznodorozhnuyu Stanciyu Velikaya Zagorovka Ostrov - Ostanovochnyi Punkt 669 Km Ostrov - Bahmackii Centralnyi Rynok Ostrov - Maryanovku Ostrov - Smotriki Ostrov - Zheleznodorozhnuyu Stanciyu Bahmach Ostrov - Strelniki Ostrov - Kotlyakovo Ostrov - Ukrainskoe Ostrov - Bahmach Ostrov - Suhovodku Ostrov - Bondari Ostrov - Zheleznodorozhnuyu Stanciyu Hutor Halimonovo Ostrov - Platformu Staryi Lug Ostrov - Zaporozhskoe Ostrov - Pashkov Ostrov - Krasnyi Kamen Ostrov - Smolyanku Ostrov - Tymailovku Ostrov - Uzrui Ostrov - Kostyuchki Ostrov - Kovali Ostrov - Zakroevschinu Ostrov - Plehov Ostrov - Kamen Ostrov - Pokrovskii Ostrov - Prirubki Ostrov - Bereznyaki Ostrov - Kruglik Ostrov - Volnu Ostrov - Rozhdestvenskoe Ostrov - Lenindar Ostrov - Maluyu Zagorovku Ostrov - Pereyaslavskoe Ostrov - Zaimische Ostrov - Avseenkov Ostrov - Chernysh