Legiamayo[1][2] or Lejiamayu[3] (possibly from Quechua lliklla a rectangular shoulder cloth, mayu river)[4][5] is a river in Peru located in the Ancash Region, Carhuaz Province, Marcará District.

[2] It originates in the Cordillera Blanca west of mount Copa, near Lake Lejiacocha.

[1][3] It is a tributary of the Marcará River, which in turn is a tributary of the Santa River.

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