[2][3][4][5][6][7][8] The Jatun Mayu originates near the villages of Ollerias and La Esquina in the Potosí Municipality of the Tomás Frías Province.

Near Walla Laqaya (Hualla Lacaya) it receives the name Challajtiri Mayu.

Before it reaches the village of Karma (or Carma) it is named Agua Castilla.

After the confluence with the Topala River in the Caiza "D" Municipality of the José María Linares Province near the village of Jirinchura at 19°54′09″S 65°47′05″W / 19.90250°S 65.78472°W / -19.90250; -65.78472 it is called Jatun Mayu again.

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