First, the context of the northern trunk: there is a northern trunk dragon sandwiched between the Yellow River and the Yalu River. The dragon that extends to the north of the Three Seas starts from Kunlun Mountain. All the way to the west of Baden County. One of them is Mount Tai in Hukou Dongyue. Another branch line extends southward to analyze the city, turns westward to become Leitou, followed by Taihang Mountain, Hengshan Mountain and Yanran until the Luanhe River is flat. "Mountain Classic" said: "Kunlun Mountain extends to the foothills of Yanshan Mountain. Every mountain range is a place of war, and the mountains extend to the northern part of the desert. The customs there are sophisticated, tough, rude and stubborn. When their son was born at the age of ten, they learned to ride horses and shoot arrows. They all learned a strong character and a strong body. Its water source is Fenhe River in Shanxi, which originates from Jiangzhou, Guangzhou and flows eastward into the sea.
Second, the context of the middle trunk: the Yellow River and the Yangtze River are sandwiched by the middle trunk dragon, extending to the East China Sea, south of the Yellow River and north of the Yangtze River, which is a new place for the middle trunk dragon. It starts from the west and passes Fengxiang in the west of Gansu: "The mountains are endless until the Big Three Pass. You can see great rivers and mountains lying in the middle, winding up and protecting them to Hanguguan. The river flows through the Yellow River like a beautiful Yuhuan." A mountain in Chang 'an originated from Xiong 'er, which is Zhongyue Mountain. From the capital of song dynasty to Yanzhou, it is Taiyue Mountain. The classic says: "The Yellow River is in the north and the Yangtze River is in the south. The two rivers are sandwiched in the middle and always angry. When Long Mai was in the Qing Dynasty, the mountain peaks suddenly rose, and Yanzhou and Dongyue Mountain stood between them. The mountains in Long Mai Branch are very beautiful. Many sages have emerged on the land of Lu. " Another branch of Long Mai reached the border between Dengzhou and Laizhou. One branch went to Zhili, Cangzhou. Its water source is Jishui, which originated in Yuanqu County. After flowing into wen county, it flows into the Yellow River, and then flows out from the south of the Yellow River to join the Chaihe River. It also flows from the northeast to Qingzhou into the sea. Hanshui River flows into the Yangtze River in Hanyang.
Third, the south trunk vein: the Yangtze River and the East China Sea sandwiched the south trunk dragon, and its tail disappeared in the south of the East China Sea. Its Long Mai starts from Minshan, gradually twists and turns to the west, then turns to Yunnan, passes through Yelang, passes through Guiling, and reaches Lingling. Here is Jiuyi Mountain, then enters Gui Lian, passes through Dageng Ridge, starts from Nanxiong, passes through Yanzhou, passes through Shaowu, reaches Guangxin, passes through Huizhou, and continues to become Tianyuan Mountain eastward, where one tributary becomes Qiantang River and the other tributary. One is Long Mai, starting from Jiankang, all the way to Jianghuai, and the other is from Lingzhou to Poyang Lake. Its water source is: Xiangshui originates in Lingling County, Yongzhou, reaches Dongting Lake and extends into the Yangtze River.
The three dry dragons mentioned above all started from Kunlun Mountain.