What does the watershed mean in Feng Shui books?

When it rains heavily, the mountain area is divided into ridges and waters on both sides. You can see the water ridges on both sides of the rain on the hard soil hills in the plain. In the same way as the mountain plain, the mouth of the mountain basket is the chin, and the chin with thick back and sharp front is the most expensive. The owner of Sutugang is rich. (solemn) think about it!