The Lucumayo (possibly from Quechua luq'u old hat that has lost ist form; hollow, depression (of an area), mayu river)[1] is a river in Peru located in the Cusco Region, La Convención Province, Huayopata District.

[2] Lucumayo river originates in the Urubamba mountain range near mount Veronica.

It crosses the district from southeast to northwest along the villages of Chachayoc, Alfamayo, Lucumayo, Huacarumiyoc, Huamanpata, Incatambo, Sarasarayoc, Huamanmarca and Huyro.

The village of Wamanmarka lies near the confluence of these rivers, on the right bank of the Luq'umayu.

It is east of Pampayoc on the border of the districts of Huayopata, Maranura and Santa Teresa.