16.5 km. Wudaohe River in taoyuan village, Shihegang Town passes through four villages and connects with Nanwan Lake, with a total length of 16.5km and a scenic area of about 100 km2. Wudao River is the main tributary of Shihe River in Huaihe River system. It winds in Wudaowan on the mountain, hence the name Wudaohe. Originated at the north foot of southwest arrow block in Dongjiahe Town, Shihe District, it flows eastward through administrative villages such as Huanglong Temple, Kongfan, Triangle Mountain, Taoyuan and Qingtang, and finally enters Nanwan Reservoir.