References Citations Sources Hill, John E. (2009) Through the Jade Gate to Rome: A Study of the Silk Routes during the Later Han Dynasty, 1st to 2nd Centuries CE. BookSurge, Charleston, South Carolina. . External links Regions of China Deserts and xeric shrublands Ecoregions of China Ecoregions of Mongolia Geography of Mongolia Geography of Xinjiang Deserts of China Deserts of Mongolia Altai Mountains Sites along the Silk Road Palearctic ecoregions