The urban areas of Xinyi, Huazhou, Gaozhou and Wuchuan are all located along Jianjiang.
The upstream mainstream of the Dongjiang River flows from Hawbaokeng and travels counterclockwise for more than 20 kilometers in the northeast-southeast direction to Dapo Village, Xinyichidong Town.
The Jianjiang River continues south for more than 50 kilometers, from Gaozhou, to reach the territory of Huazhou.
After the Jianjiang River reaches Meilu, several tributaries have been injected, and there is a massive water flow.
Part of the water flows through the Tangwei Flood Diversion River, built in the 1960s to the sea, and the remaining water flows from Huangpo to the mouth of Shajiao Xuan in Wuyang Town, into the South China Sea.