Iogach (Russian: Иогач; Altay: Ыйык-Агаш, Iyık-Agaş) is a rural locality (a selo) in Artybashskoye Rural Settlement of Turochaksky District, the Altai Republic, Russia.

Iogach is located near the place, where the Yogach River flows into the Biya River, 69 km south of Turochak (the district's administrative centre) by road.

Artybash is the nearest rural locality.

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