Piranhas River (lower Araguaia River tributary)

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{{Infobox river

| name = Piranhas River

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| source1_location = Tocantins state

| mouth = Araguaia River

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| subdivision_type1 = Country

| subdivision_name1 = Brazil

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The Piranhas River is a river of Tocantins state in central Brazil. The Piranhas joins the Araguaia River in the west-central area of Tocantins state near the municipality of Araguacema.