The Yuraqmayu (Quechua yuraq white, mayu river,[1] "white river", hispaniciced spelling Yuracmayo) or Río Blanco (Spanish for "white river") is a 36.2 km long river in Peru located in the Lima Region, Huarochirí Province, in the districts of Chicla and San Mateo.

It is a left tributary of the Rimac River which empties into the Pacific Ocean.

[2][3] The river originates in the San Mateo District, southeast of Kunkus Yantaq.

Upstream it is the natural border between the districts of Chicla and San Mateo.

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