Hatun Ch'aqu (Quechua hatun big, ch'aqu a fine, whitish, edible and medicinal clay, Diccionario Quechua - Español - Quechua, Academía Mayor de la Lengua Quechua, Gobierno Regional Cusco, Cusco 2005 (Quechua_Spanish dictionary) (5-vowel-system) Hispanicized spelling Jatunchajo) is a mountain in the Andes of Peru, about 5000 meters high.