What is the middle reaches of Dongjiang River like?

The middle reaches of Dongjiang River are from Yuanheba Village in Fengshuba Reservoir to Guanyinge in Boluo County, with a length of 232km and an average slope of .31‰. The terrain below Longchuan gradually decreases, and a plain appears on the right bank of Dongjiang River in the upper reaches of Guanyinge, while the left bank is still hilly. The main tributaries that flow into this reach along the river are Lianjiang, Xinfeng and Qiuxiang. Lianjiang River, located on the right bank of Dongjiang River, originates from Yapoji, Lianyuan Township, peace county, and flows southeast to Dongshui Street, peace county to enter Dongjiang River. The catchment area is 1677 square kilometers, the river is 1 kilometers long, and the river slope is 2.2‰. Xinfeng River, located on the right bank of Dongjiang River, originates from Yaposhi in Xinfeng County and joins Dongjiang River in Heyuan City. The catchment area is 5813 square kilometers, the length of the river is 163 kilometers, and the average slope of the river is 1.29‰. Xinfengjiang Reservoir Station (with a catchment area of 5,734 square kilometers) has an average annual runoff depth of 1,87.5 mm and an annual runoff of 6.22 billion cubic meters. Xinfengjiang Reservoir and Hydropower Station have been built. The main tributaries are Lianping and Chuantang River. Qiuxiang River, located on the left bank of Dongjiang River, originates from Li Tou Village in Zijin County and flows into Dongjiang River at the estuary of Huiyang County. The catchment area is 1669 square kilometers, the length of the river is 144 kilometers, and the average slope of the river is 1.11‰.