| Kachi Mayu | |
| Name Etymology: | Quechua |
| Subdivision Type1: | Country |
| Subdivision Name1: | Bolivia |
| Subdivision Type3: | Region |
| Subdivision Name3: | Oruro Department |
| Source1: | Andes |
| Source1 Location: | Condo "C" Canton, Oruro Department |
| Source1 Coordinates: | -19.3333°N -86°W |
| Source1 Elevation: | 4600m (15,100feet) |
| Mouth: | Pillku Mayu |
| Mouth Location: | Potosí Department, Urmiri Municipality |
| Tributaries Left: | Pupusa Pallqa, Waylla Wint'u, Phaq'u Q'awa |
| Tributaries Right: | Castilla Chita, Qullpa Jawira |
Kachi Mayu (Quechua kachi salt, mayu river, "salt river", hispanicized spelling Cachi Mayu) is a Bolivian river east of Poopó Lake in the Oruro Department, Challapata Province, Challapata Municipality. Its source, the Jach'a Juqhu River, is considered the origin of the Pillku Mayu.[1]
The Jach'a Juqhu River (Aymara jach'a big, great, juqhu muddy place, "great muddy place", hispanicized Jachcha Jokho) originates in the Sebastián Pagador Province (which is identical to the Santiago de Huari Municipality), Condo "C" Canton[2] [3] at a height of 4,600 m south west of the mountain Wila Qullu. It flows in a northeastern direction. Southwest of the village of T'ula Pallqa the Jach'a Juqhu River meets Pupusa Pallqa River. Now the river successively receives the names T'ula Pallqa, Aguas Calientes and Kachi Mayu. From the point of the confluence with the Ch'illawa River, already in the Potosí Department, Urmiri Municipality, the river gets the name Pillku Mayu.
There is another river of the same name, Kachi Mayu in the Oropeza Province of the Chuquisaca Department, which is a left tributary of the Pillku Mayu.
