Yíyuán

Yiyuan is the hill country around the sources of the Yi River in central Shandong. One branch descends from the slopes southwest of Mount Lu, while another rises near Laosong Mountain; the waters meet before flowing southeast toward Yishui. Under the Yuan, Ming and Qing, the surrounding lands were divided among Yishui, Mengyin and Linqu. Villages and fields occupied the lower valleys, with wooded ridges and mountain streams between them.