Gagamachay or Qaqa Mach'ay (Quechua qaqa rock, mach'ay cave,[2] "rock cave", also spelled Gagamachay) is a mountain in the Andes of Peru which reaches a height of approximately 4,400 m (14,436 ft).

It is located in the Ancash Region, Huari Province, on the border of the districts of Anra and Huacachi, and in the Huánuco Region, Huamalíes Province, Singa District.

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