Pukamayu (Quechua puka red, mayu river,[1] "red river", hispanicized spelling Pucamayo) or Antachaka (Quechua anta copper chaka bridge, "copper bridge", hispanicized Andachaca) is a river in the Daniel Alcides Carrión Province of the Pasco Region in Peru.

Pukamayu originates near the lakes Qiwllaqucha (Quiulacocha) and Karpakancha (Carpacancha) in the south of the province.

The river gets waters from little streams like Yuraq Yaku (Yuracyacu), Chachaq (Chachac) and Ranra Kancha (Ranracancha).

Near Chinchi Tinku (Chinche Tingo) Pukamayu meets the Río Blanco (Spanish for "white river") coming from the west.

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