Jatun Mayu[1] (Quechua hatun, jatun big, great, mayu river,[2] "great river") which upstream is called Tinkipaya is a Bolivian river in the Potosí Department, Tomás Frías Province, Tinkipaya Municipality, Tinkipaya Canton,[3] north of Potosí.

It is a left tributary of the upper Pillku Mayu.

[4] The confluence is about 10 km south east of Tinkipaya.

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