It is formed by tributaries that descend the Serra Geral, the mountains that divide eastern Goiás and Bahia.

[citation needed] Farther to the north the Paranã becomes the main tributary of the Tocantins River on the right bank.

Today it is crossed by a long concrete bridge between the municipalities of Iaciara and Nova Roma.

It forms the valley which makes up a vast region called the Vão do Paranã Microregion.

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