yiyuanxianIntroduction：Wuyuan Introduction: Wuyuan County is located in the central part of Shandong Province and belongs to Zibo City. The longest inland river in Shandong Province originated here, and Wuyuan was named after it. It has 11 towns and 1 economic development zone with a total area of ​​1,636 square kilometers and a population of 560,000 (2009). Wuyuan County is the birthplace of ancient humans in Shandong, the ecological highland of Shandong Ridge, the hometown of caves in northern China, and the hometown of Cowherd and Weaver Girl.