Ploskoseminsky () is a rural locality (a settlement) and the administrative center of Ploskoseminsky Selsoviet, Rebrikhinsky District, Altai Krai, Russia. The population was 359 as of 2013.Численность населения по муниципальным образованиям на 1 января 2011, 2012, 2013 гг. (в том числе по населённым пунктам) по данным текущего учёта There are 4 streets.
Geography Ploskoseminsky is located 18 km southeast of Rebrikha (the district's administrative centre) by road. Dalny is the nearest rural locality.Расстояние от Плоскосеминского до Ребрихи
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