Naxi Ethnic Township in Markam County, Chamdo, Xizang, sits along the banks of the Lancang River. Local salt production dates back to the Tang Dynasty and has continued for over 1,300 years.Naxi Ethnic Township in Markam County, Chamdo, Xizang, sits along the banks of the Lancang River. Local salt production dates back to the Tang Dynasty and has continued for over 1,300 years.