Yaho or Yayo[1] is an archeological site 160 kilometers northwest of Koro Toro, Chad.

In 1961, Yves Coppens excavated a partial hominin face and erected the taxon Tchadanthropus uxoris.

The delta is very well preserved, standing up to 330m tall, as it can be observed sloping into a mudstone and diatomite-filled basin that drops 240m.

The delta was fed by a braided fluvial distributary leading from the Tibesti Mountains from the north.

[4] On March 16, 1961, Yves Coppens' wife, Françoise Le Guennec,[5] discovered a hominin fossil at one end of the Angamma cliff, 11 kilometers from the western well of Yayo.

Initially, the specimen was assumed to be an australopithecine, but Coppens would later assign it the temporary name Tchadanthropus uxoris[6] based on the country and lake of origin and honoring Le Guennec.

The face is broad and short, but due to erosion of the upper jaw, its entire height cannot be calculated.

The frontal process bears a posterior obliquity that might signify a high zygomatic root.

[6] He assigned the provisional name Tchadanthropus uxoris to the find as a placeholder until greater understanding of human evolution could allow for taxonomic simplification.