sentences:  , new searches are being conducted by using drones.In 2015 and 2016, two expeditions led by French archeologist Pierre-Henri Giscard, a specialist in Mongolian archeology, and Raphaël Hautefort, a specialist in scientific imaging, around the Khentii mountains (North East of Mongolia) support the theory of a tumulus at the top of the Burkhan Khaldun mountain.Their non-invasive analysis, carried out with drones, shows that the -long tumulus is of human origin and probably built on the model of the Chinese imperial tombs present in Xi'an.