Ust-Bartaga (Russian: Усть-Бартага; Bashkir: Бартағатамаҡ, Bartağatamaq) is a rural locality (a village) in Verkhnesuyansky Selsoviet, Karaidelsky District, Bashkortostan, Russia.

Ust-Bartaga is located 73 km northeast of Karaidel (the district's administrative centre) by road.

Sedyash is the nearest rural locality.

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