My hometown is in Sima town of Changping Country .There is a clear river named Sima River.

Sima River is the first tributary of Qujiang River, the ancient name for Sorrow Rong water, and also known as Double Bridge River and Stone Pillars River. There are about 10 headwaters of Sima River. The primary source is Pine-top of Pinggang town in Nanjiang County. The headwaters elevation is 1,140 meters, southeast inflowing C in the north of Bazhong Country. Then it turns south to flow through White Temple and Guandu to Qingjiang River at the south of Dahe town and the right of Nan Shuining temple. After that it is named after Sima River;

The main river-stem is 86.7 kilometers long, the valley area of 1316 square kilometers. The river average gradient is 1．37‰. It is steeper in the upstream but more gentle in the middle-down stream. The average width of the river is about 50 meters. Watershed is fan-shaped and has developmental river systems. Tributary is densely covered. The river system distributes a typical arborization and the density of the water network is per square kilometer 2.2 kilometers.

There are three tributaries of which valley area is more than 50 square kilometers. The largest tributary is Qingjiang River. The upstream source is divided into two branches, both in Bazhong Country border. The west branch named after Huacheng River, comprise of five small rivers such as White -rock River , Lijia River, LeiJia River, Wujia River and so on. They converge each other at the Huacheng reservoir, and then flow through Qizhang town. At last, they gather together in the Qingjiang town and Triadius River. The east branch called after Triadius River, includes four small rivers. For example, Hejia River, Baijia River, Xianjia River and Luojia River and so on. They run through Zhongxing countryside and meet with Huacheng River at Qingjiang town.

After converging Huacheng River and Triadius River each other, they are together named after Qingjiang River. They go into Sima River at the south of Shuining temple finally.