Ancient Irrigation System in Mohuchahan Valley, China (image) Washington University in St. Louis Share Print E-Mail Caption An ancient irrigation system along the Tian Shan mountains of China allowed the cultivation of crops in one of the world's driest climates. Credit Image courtesy of Yuqi Li, Washington University in St. Louis. Usage Restrictions None Share Print E-Mail 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.