Geomantic omen called the rolling mountains Long Mai, and ancient geomantic omen initiated the "five geographical techniques", namely "finding dragons, checking sand, watching water, acupoints and standing upright". Dragon is the geographical context, soil is the meat of dragon, stone is the bone of dragon, and vegetation is the hair of dragon. Looking for dragons, we must first find the mountains of ancestors and parents, judge the pulse, don't be angry, and divide yin and yang.
Long Mai refers to the land pulse as enchanting and fragrant as a dragon. The vein is marked by the trend of mountains and rivers, so Mr. Feng Shui called it Long Mai, which is a vein walking with mountains and rivers.
There are at least 24 dynasties in the history of China. If every dynasty had Long Mai, then China had at least 24 Long Mai.
Tang's is in the Yellow River valley; Long Mai of the Zhou Dynasty was in Qishan; Long Mai of the Qin Dynasty was in Xianyang; Long Mai in Han Dynasty was in Pei County; Long Mai in the Western Jin Dynasty was in Hanoi; Long Mai of Sui Dynasty was in Hongnong; Long Mai in Tang Dynasty was in Chang 'an, Longxi and Taiyuan. Long Mai lived in Kaifeng, Gongyi and Luoyang in Song Dynasty. Long Mai in Yuan Dynasty was in Inner Mongolia grassland; Long Mai of the Ming Dynasty was in Fengyang, Anhui; Long Mai in Qing Dynasty was in the northeast.