Willkamayu (Quechua, hispanicized spelling Huyllcamayo) is a river in Peru located in the Ayacucho Region, Victor Fajardo Province, Huancapi District.

[1] Willkamayu originates near the village Llusita at the confluence of the rivers Urqu Mayu (Orcco Mayo) and Kachimayu (Cachimayo) of the Huancaraylla District.

It flows almost parallel to Kinwamayu east of the Willkamayu.

Near the village of Willka (Huilcca) Willkamayu meets the Pampas River.

This article related to a river in Peru is a stub.