The Piriá River () is a river of Marajó, which itself is an island in the Amazon Delta. It is located in the state Pará in northern Brazil, and is a tributary to the Pará River.
The Piriá originates from three streams that flow from the flooded igapó forests on Marajó Island. A village that is also called Piriá is located on its left bank, a little upstream from where it flows into the Pará River.
The river runs through part of the Terra Grande-Pracuúba Extractive Reserve, a sustainable use conservation unit created in 2006.
See also List of rivers of Pará
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