Jatun Huaychahui (possibly from Quechua hatun big, "big Huaychahui") also known as Huaychahui (possibly from Aymara waych'a Minthostachys mollis, -wi a suffix, "place of waych'a plants"), is a mountain in the Andes of Peru. It is the highest mountain in the Huanzo mountain range. Jatun Huaychahui is located in the Arequipa Region, on the border of the Condesuyos Province, Cayarani District, and the La Unión Province, Puyca District, and in the Cusco Region, Chumbivilcas Province, Santo Tomás District. It lies southwest of Huiscatongo.
References Juan van Kessel, Dionisio Condori Cruz, Criar la Vida - trabajo y tecnología en el mundo andino usgs.gov USGS, Peruvian Cordilleras Inventario Nacional de Glaciares y Lagunas, Inventario de Glaciares del Perú, ANA (Autoridad Nacional del Agua), Huaraz 2014 (see sketch map of the Waych'awi glaciar)
escale.minedu.gob.pe - UGEL map of the Chumbivilcas Province (Cusco Region)