Long Mai is because Changbai Mountain is rich in products, and I don't want the Han people to know too much. The Manchu people wanted to build this place with the Mongols and realize the partition of Manchu and Han. The ancient Changbai Mountain is full of mysterious, life-prolonging Ganoderma lucidum and life-saving ginseng. There are countless kinds of natural materials and treasures. Blockade can protect resources. In case the customs change in the future, Manchu can return to Northeast China peacefully.
The Qing royal family originated from the Jurchen nationality, and the northeast region was their activity area. But compared with the Han nationality, their population is not large. The rulers of the Qing dynasty were not confident enough about how long they could rule this territory outside the customs. Therefore, they need to choose a place with beautiful scenery and rich resources as their logistics support, which can be supplemented if the resources are insufficient in the later period. Once the rule is over, you can retreat to this habitat, better repair your troops and save your strength.
In order to better protect the ancestral graves, it is said that the father of Nuerhachi, the ancestor of the Qing Dynasty, found the cemetery with ashes. I asked Mr. Feng Shui when passing through Yun Qi Mountain, the remaining vein of Changbai Mountain, and told him that this place is the land of Longxing, so Nurhachi buried the ashes of his ancestors here, as well as the ashes of his grandfather, great-grandfather and other 12 old people, which is now the Qingyong Mausoleum.