Tianshui is colorful and blue. Just under the endless Danjiangkou Reservoir, there is an ancient underwater city, which is called Longcheng by the local people in Zhechuan. This ancient underwater city is probably the first capital of ancient Chu State-Danyang, the capital of Chu State. What kind of historical sites are concealed by the vast Danjiang River, which has aroused the exploration of archaeologists and made them unable to give up their pursuit. After so many years, can the mystery of Dragon City be finally solved?
Longcheng, located in Xichuan County, near Danjiang Reservoir, is surrounded by mountains, with mountains in the north and water in the south, and the ancient tombs are far away. When Danjiang reservoir was not built, people didn't pay much attention to it and didn't know much about its culture. Who knows that when the reservoir was built, many ancient tombs appeared. It makes people re-examine Chu culture and start looking for early Chu civilization here. With the excavation of aristocratic cemeteries and various ancient cultural relics, the whole reservoir area has attracted countless scholars who study Chu culture.
Through the unremitting efforts of archaeologists, a new clue has been found, that is, the ruins of the ancient city of Longcheng. Therefore, many scholars believe that Danjiangkou Reservoir is probably the original fief of Chu State as mentioned by Sima Qian, and Longcheng, which has been passed down from generation to generation by local people, is probably the capital of Chu State. This understanding has attracted many archaeologists to Danjiangkou Reservoir for archaeological research, looking for more evidence, thus proving that this place is Danyang, the capital of Chu State.