The Piranhas River or Açu River is a river of northeastern Brazil.
Piranhas River may also refer to:
- Piranhas River (Goiás), in central Brazil
- Piranhas River (lower Araguaia River tributary), in west-central Tocantins near Araguacema
- Piranhas River (upper Araguaia River tributary), in northern Tocantins near Araguatins
This disambiguation page lists articles about distinct geographical locations with the same name.
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