Ploskoye (Russian: Плоское) is a rural locality (a selo) and the administrative center of Ploskovsky Selsoviet, Tretyakovsky District, Altai Krai, Russia.

Ploskoye is located 33 km southeast of Staroaleyskoye (the district's administrative centre) by road.

Yekaterininskoye is the nearest rural locality.

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