Why should feng shui be "surrounded by mountains and waters"?

Why do you want to be surrounded by mountains and waters in geomantic omen?

from the perspective of feng shui, the first principle of good feng shui is "surrounded by mountains and surrounded by water". In other words, there are mountains behind to rely on, people to prosper, and water in front to surround and prosper.

the Xuanwu square in feng shui is the back of a house, which is the place where the mountain is backed. Therefore, the position of the backer is also called Xuanwu. If the position of the backer is not good, the principal official will be robbed by thieves. Because Xuanwu is a dark god, abnormal peach blossoms appear. Feng Shui takes the front as the direction, is in charge of wealth, and the back is sitting on the mountain, which is in charge of people. Therefore, it is very important for a house to rely on the mountain. There are real mountains behind a house. The mountains are handsome and the vegetation is Hua Mao, which means the people who live here are smart, delicate, beautiful and dignified.