Where is the ancient Furong Lake in Jiangyin?

According to the survey, Furong Lake, formerly known as Shang Hu and Sheguihu, is located at the junction of Wuxi, Jiangyin and Changzhou. Before the Northern Song Dynasty, the lake was vast and blue, more than 100 miles from north to south. It is a water area near Taihu Lake in the south of the Yangtze River, with an area of "15,300 hectares". Lu Yu, a Cha Sheng in the Tang Dynasty, said: "There is a lake in the northeast of Huishan, digging Changzhou in the south, Jiangyin in the east and Jinling in the north, which is misty and forced by Xuan Lu"; "Since it was built more than a hundred miles below the mountain, the lotus kept flowing, thinking that the smoke and water in the south of the Yangtze River were exhausted." According to the "Lotus Lake Dike Repair Record", "Furong Wei, the ancient Furong Lake, is connected to the Yangtze River in the east, Longshan in the south, Du Yun in the west, and the suburbs of the county in the north, surrounded by Fang Mao and Qinwang Mountains; The smoke is mighty, facing a hundred miles. " After the Song Dynasty's southward migration, there was a sharp increase in immigrants from the south of the Yangtze River, and the demand for cultivated land was increasing. The wind by the lake is unstoppable. Since then, the water area has decreased sharply, which has seriously damaged the balanced water conservancy system. The imperial court was tempted by the huge immediate interests of enclosure, and the policy was stopped from time to time. It lingers in the contradiction between returning farmland to the lake and reclaiming farmland around the lake, and the disappearance of Furong Lake began at this time. The floods in Furong Lake area are getting worse. In the Ming Dynasty, there was even a "land without grass and skin without trees" in the land of plenty. At that time, Zhou Chen, the governor of Jiangnan, was determined to rectify in an all-round way. Zhou Chen adopted the idea of Hua Shan, a water conservancy expert in the Song Dynasty, and adopted the method of "blocking and discharging simultaneously, turning harm into benefit" to lead the people of Sanyi Lake to build dikes on the surface of Furong Lake to stop the inflow of river water and open canals around it. The gate of Huangtian Port in Jiangyin opened to let Furong Lake flow into the Yangtze River. Then, embankment was built around Furong Lake, and100,000 mu of polder field was opened in the polder field, forming the spectacle of "108,000 Furong Wei". In order to prevent the accumulation of water in the dike, a water lifting tool-water scoop machine was built, and the accumulated water can be discharged at any time. In order to prevent the lake and river from flowing backwards, a sluice was built, and finally the flood was subdued. The area of Furong Lake has decreased sharply. During the Hongzhi period of the Ming Dynasty, after more than 70 years of Zhou Chen's water control, the waters of Furong Lake were still "fifty miles away". Ronghu Village, which was built by the lake during the Jiajing period of the Ming Dynasty, has been "contiguous fields, harbor disputes, bridges and dams exhausted, and villages appeared". By the Qing Dynasty, Furong Lake had shrunk into a small lake of less than 20 square kilometers. Now Furong Lake has completely disappeared, leaving only furong town, Furong Mountain, Ronghu Village, Lianrong Gate and Lianrong Bridge.