Yiyuan is a county in the centre of China's Shandong province and is located in the deep Tai-yi Mountains, and is the southernmost county-level division under the jurisdiction of Zibo City. It had a population of 549,500 in 2010, of which 104,200 lives in the county town. Yiyuan has the nickname of “Roof of Shandong” because of its highest average altitude among all counties within the province, although it does not contain the provincial highpoint of Mount Tai.
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