Also called the SACRED VALLEY of the Inkas, it became very popular around 90 years ago colonial used to call it WILLKA MAYU because the River was the reason why Inca people were sacred they compared the river with the Milky Way because December 22 the Axel of the milk way is on the dirección with source of river that would be the reason why Incan Astronomers called SACRED river and called as sacred valley.