| Yuraqmayu | |
| Name Other: | Río Blanco |
| Name Etymology: | Quechua |
| Subdivision Type1: | Country |
| Subdivision Name1: | Peru |
| Subdivision Type3: | Region |
| Subdivision Name3: | Lima Region |
| Length: | 36.2km (22.5miles) |
| Source1 Location: | San Mateo District |
| Source1 Coordinates: | -11.8736°N -76.0739°W |
| Mouth Location: | Chicla-San Mateo |
| Mouth Coordinates: | -11.7331°N -76.2692°W |
| Yuraqmayu Dam | |
| Location Map: | Peru |
| Dam Height: | 56m (184feet) |
| Dam Length: | 590m (1,940feet) |
| Res Capacity Total: | 46500000m2 |
| Plant Operator: | Edegel |
The Yuraqmayu (Quechua yuraq white, mayu river, "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.
The river originates in the San Mateo District, southeast of Kunkus Yantaq. Its direction is mainly to the northwest. Upstream it is the natural border between the districts of Chicla and San Mateo. The confluence with the Rimac River is south of Chicla.
The Yuraqmayu dam which was erected near the village of Yuraqmayu at was erected in 1995. It is 56m (184feet) high and 590m (1,940feet) long. It is operated by Edegel. The reservoir has a volume of 1667000m2 and a capacity of 46500000m2.