Jatun Mayu (Linares)
 Jatun Mayu (Quechua hatun jatun big great mayu river great river) is a Bolivian river in the Potosí Department José María Linares Province. It belongs to the Pillku Mayu river basin. The river flows through the province in a south eastern direction. After its confluence with the Horno Mayu it receives the name Qaysa (Caiza). Qaysa River is a left tributary of Tumusla River.