What Long Mai said originated from China's geomantic theory. In Long Mai, the land where aura gathers is considered as a treasure trove of geomantic omen, that is, the "Dragon Cave", and the tombs of emperors in past dynasties are naturally the first inhabitants of the treasure trove of geomantic omen. In different dynasties, every emperor had his own views on the land of geomantic omen, so the imperial tombs of different dynasties were scattered all over China. But there is a mountain range that is considered to be the best place for geomantic omen and the most ideal burial place for ancient emperors. There are 24 emperors buried here, Mangshan Mountain.
Mangshan Mountain is also called North Mangshan Mountain. There is a folk saying that "born in Suzhou and Hangzhou, buried in Beimang". People think that North Mangshan Mountain is the ideal destination of life, which shows the recognition of Mangshan Feng Shui. Mangshan Mountain is located in the north of Luoyang, on the south bank of the Yellow River, and is a branch of the Qinling Mountains. It is only about 250 meters above sea level and stretches from east to west 190 kilometers. Although this mountain range is not tall and majestic, it surrounds Luoyang City like Wolong.