 Régis and Jartoux reached the western edge of the Great Wall at Jiayuguan and completed their work by the mensuration of an interior lateral wall which had brought them to Xining, on the frontier of Tibet, near Lake Kukunor.They returned to Beijing on 10 January 1709.Their map pleased the Kangxi Emperor, who requested the continuation of the work for the provinces outside the Great Wall and for China proper.