The Ubagan (Kazakh: Обаған Obağan; Russian: Убаган) is a river of Kazakhstan and Russia, a right tributary of the Tobol.

The river originates in lake Karachinsky and flows northwards along the Turgay Depression.

About Abagana present article in ASBE: Ubagan river Akmola and Turgay regions (Obagi) is a right tributary of the Tobol river; originates in the southern slopes of the mountains Kosharovsky in Akmola region and in the upper reaches bears the title Burduli-Tal.

Then, a short 60 miles to the Northern edge of the region, the river is deflected to the West and flows into the Tobol already from Orenburg province, 10 versts from the village of Zverinogolovskoe.

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