Yanamayo (possibly from Quechua yana black, mayu river,[1] "black river") is a river in the Ancash Region in Peru.

It flows along the border between the provinces Carlos Fermín Fitzcarrald and Mariscal Luzuriaga and empties into the Marañón River as a left tributary.

The confluence is on the border of the districts Eleazar Guzman Barron, San Nicolás and Canchabamba.

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