The Tumara (Russian: Тумара; Yakut: Тумара) is a river in the Sakha Republic (Yakutia), Russia, a right tributary of the Aldan, part of the Lena basin.

In the upper section of its course the river displays all the characteristics of a mountain river, flowing roughly southwards within a deep and narrow valley bound by steep slopes that cuts across the Kelter (Көлтөр) and Munni (Мунний) ranges.

[5] After leaving the mountainous area in its middle course the Tumara flows through a floodplain and forms meanders, still following a generally southward direction.

In its lower course the river expands and the floodplain becomes wider, its riverbed dividing into slowly-flowing arms.

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