This map plots the settings and references in Balzac and the Little Chinese Seamstress

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Page 11. " reach the banks of the River Ya and the small town of Yong Jing "
Hilly terrain of Yongjing
Creative Commons Attribution Share AlikeHilly terrain of Yongjing - Credit: Vmenkov

There is a town called Yongjing in western Gansu province, on the Yellow River (Huang He), north of the Liujiaxia Reservoir, or Bingling Lake. It is in a mountainous and hilly region.  However this is some way from Sichuan and Tibet, so it is not clear whether this is the town Dai Sijie had in mind.