Napak XV is a fossil site near Iriri in Karamoja, Uganda.
The Napak XV fossil find of an Ugandapithecus Major was discovered on July 18, 2011. Ugandapithecus Major is an extinct form of Ape, attributed to be the remote cousin of Hominidea. The remains at Napak XV show that this species lived around 20 million years ago in Uganda. The several other skeletal elements of the same species, found earlier at other sites near Napak Volcano, suggest that Ugandapithecus Major was an arboreal herbivore.
The first partial skull of Ugandapithecus Major was found at Napak Volcano. Fragments of the lower jaw determine that the extinct ape was roughly 10 years old (a young adult male) at the time of death. The teeth are fully erupted but not heavily worn. The skull is of similar dimensions to that of a large male chimpanzee, but with teeth the size of a gorilla's.