It is located on Jingshan Stream, one of the branched of Daan River, about 2 kilometers east of the Railway Mountain Line. The flood bed covers an area of 600 hectares spanning over Sanyi, Dahu and Jhuolan. In the area between the railway and the reservoir, the direction of the Jingshan Stream extending from east to west is almost rectangular to the direction of the stratum, and it actually forms a typical transverse valley. There are fewer ups and downs in the riverbed around the area with an elevation from 200 to 210 meters, and bigger and deeper waters often appear along the river channel. The area is rich in aquatic resources. Rice fields are few along the lower river terrace. Dry farms are quite common and mostly grow fruits such as pears, plums, persimmons, and sugar canes.