Chaotianmen is located in the confluence  of Yangtze River and Jialing River. Its terrain is higher in the middle and downwards in its two sides. Dai Ding extended the old city of Chongqing in early Ming Dynasty. He constructed 17 city gates under the rule of “nine palaces and eight diagrams”, among which Chaotianmen is the biggest one. There were four Chinese characters: Gu-Yu-Xiong-Guan (in Chinese means impregnable pass of the city). It faces the capital city – Nanjing and the Yangtze River flows toward the east. People would be here to receive the imperial decree. Hence it was named Chaotianmen. Chongqing was opened as a trade port and established customs at Chaotianmen in 1981. The old city gate was dismantled for the construction of Chaotianmen Port in 1927. The “September 2″ fire disaster turned the areas about 2000 meters from Chaotianmen into a ruin. After that disaster, there were only broken base and blocks. Today, there is the newly built Chaotianmen Square in the Chaotianmen Port. It has become the best place for enjoy the landscape of the banks and overlook the meet of Yangtze River and Jialing River.Jialing River is in the left of Chaotianmen. It absorbs trickles and stretches 1119 kilometers. It falls into Yangtze River here. The clean water of Jialing River meets the brownish yellow water of Yangtze River. You could see the color difference of the water and torrential whirlpools like running horses, that looks really spectacular. Yangtze River is in the right of Chaotianmen. It becomes more powerful after it absorbed the water of Jialing River. It passes through Three Gorges and stretches thousands of miles. It has become the “gold watercourse” on Yangtze River.