The Armu (Russian: Арму) is a river in Krasnoarmeysky District of Primorsky Krai, a tributary of the Bolshaya Ussurka.

It is 201 kilometres (125 mi) long. The river's drainage basin covers about 5,424 square kilometres (2,094 sq mi). The longest tributary of the Armu is the Obilnaya, 101 kilometres (63 mi) long.

The river is a popular place of tourism and fishing. One brand of vodka has been named after it.

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