Pilcomayo is a river in central South America. At 1,100 kilometres (680 mi) long, it is the longest western tributary of the Paraguay River. Its drainage basin is 270,000 square kilometres (100,000 sq mi) in area, and its mean discharge is 200 cubic metres per second (7,100 cu ft/s).
The Santa Elena River is a river of Bolivia in the Chuquisaca Department, Nor Cinti Province, partly on the border of Inka Wasi Municipality and San Lucas Municipality. It is a right affluent of the upper Pillku Mayu.
The Cotagaita River is a river of Bolivia in the Potosí Department, Nor Chichas Province, Cotagaita Municipality. It is a right affluent of Tumusla River and belongs to the Pillku Mayu river basin..
The Yura River is a river of Bolivia in the Potosí Department, Antonio Quijarro Province. Its waters flow to the Pillku Mayu while the river successively receives the names Toropalca, Tumusla, Camblaya and Pilaya. Pilaya River is a right tributary of Pillku Mayu.
Jatun Mayu which upstream is called Tinkipaya is a Bolivian river in the Potosí Department, Tomás Frías Province, Tinkipaya Municipality, Tinkipaya Canton, north of Potosí. It is a left tributary of the upper Pillku Mayu. The confluence is about 10 km south east of Tinkipaya.
Kachi 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.
Kachi Mayu is a Bolivian river in the Chuquisaca Department, Oropeza Province, in the Sucre and Yotalla Municipalities. It is a left tributary of the Pillku Mayu, not to be confused with the Kachi Mayu in the Oruro Department which is the headwater of the Pillku Mayu. The confluence is on the border of the Yotalla Municipality and the Potosí Department, west of the village of Tasapampa.
Chullqi Mayu is a Bolivian river in the Chuquisaca Department, Oropeza Province, Yotalla Municipalities. It is a left tributary of the Pillku Mayu.
Ch'aki Mayu, also Kachi Mayu, is a Bolivian river in the Potosí Department. It flows towards the Pillku Mayu.
Tarapaya River, originally also called Qayara, is a Bolivian river in the Potosí Department, Tomás Frías Province. Its direction is mainly north. Tarapaya is a right tributary of the upper Pillku Mayu.
Jatun Mayu which downstream successively is named Challajtiri Mayu, Rosario, Agua Castilla, Jatun Mayu again and Qaysa is a Bolivian river in the provinces of Antonio Quijarro, José María Linares and Tomás Frías of the Potosí Department. It belongs to the Pillku Mayu river basin.
Inka Wasi is a Bolivian river in the Chuquisaca Department, Nor Cinti Province. It is a left tributary of the Pilaya River, an important right affluent of the Pillku Mayu.
T'uruchipa is a Bolivian river in the Potosí Department, José María Linares Province, Ckochas Municipality, T'uruchipa Canton. It is a right tributary to the Pillku Mayu.
Chiñi Mayu is a Bolivian river in the Chuquisaca Department, Nor Cinti Province, San Lucas Municipality and Camargo Municipality. It belongs to the Pillku Mayu river basin.
The Tatasi River is a Bolivian river in the Potosí Department, Sud Chichas Province, Atocha Municipality and Tupiza Municipality. It is a left tributary of the Tupiza River and belongs to the river basin of the upper Pillku Mayu.
Puka Pampa River is a Bolivian river in the Chuquisaca Department, Sud Cinti Province, Culpina Municipality. It is a left tributary of the Pilaya River, an important right affluent of the Pillku Mayu.
Q'umir Qucha is a small artificial lake in Bolivia south east of Potosí. It is about 0.24 km long and 0.17 km at its widest point. The lake is part of the river basin of the upper Pillku Mayu.
Jatun Q'asa is a 4,590-metre-high (15,059 ft) mountain in the Bolivian Andes. It is situated in the Potosí Department, Tomás Frías Province, Potosí Municipality. Some of the nearest settlements are Umallani and Salla K'uchu. Jatun Q'asa lies east Wayra Wasi, between the Ch'aki Mayu in the west and the Challwiri River (Challviri) in the east. Both rivers flow to the north as right tributaries of the Pillku Mayu.
Mulli Urqu is a 2,906-metre-high (9,534 ft) mountain in the Bolivian Andes. It is located in the Chuquisaca Department, Oropeza Province, Yotala Municipality. Mulli Urqu lies west of the Kachi Mayu which is a left tributary of the Pillku Mayu.
Wallqayuq Urqu is a 4,124-metre-high (13,530 ft) mountain in the Bolivian Andes. It is located in the Chuquisaca Department, on the border of the Azurduy Province, Tarvita Municipality, and the Jaime Zudáñez Province, Icla Municipality. Wallqayuq Kimray lies west of Wisk'achani and northeast of Wanaku Kimray. The Phaqcha Mayu originates south of the mountain. It flows to the south as an affluent of the Qucha Mayu which downstream is named San José. It is a left tributary of the Pillku Mayu.
