Silk Road Routes Study Area (IMAGE) Washington University in St. Louis Caption This is the geography of Inner Asian study zone (in color) and location of main Silk Road cities across Asia. Credit Source: Michael Frachetti Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.