Kostin Log () is a rural locality (a selo) in Kostino-Logovskoy Selsoviet of Mamontovsky District, Altai Krai, Russia. The population was 1,209 in 2016.Численность населения Российской Федерации по муниципальным образованиям на 1 января 2016 года There are 12 streets.
Geography Kostin Log is located 42 km east of Mamontovo (the district's administrative centre) by road. Travnoye is the nearest rural locality.Расстояние от Костина Лога до Мамонтова
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