Rio Tainhas (Portuguese: Rio Tainhas) is a river in the state of Rio Grande do Sul, Brazil.

It is a left tributary of the Das Antas River[a] Part of the course of the river, including the Cachoeira do Passo do S, a waterfall, is protected by the 6,655 hectares (16,440 acres) Tainhas State Park, created in 1975.

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