This sentence comes from the geomantic classic "Shake the Dragon Sutra". The original text is: looking for a dragon must look at the mountain. Heavy entanglement is a heavy obstacle. If you shut the door with a thousand locks, there must be a prince living here. The words are slightly different, but the general meaning is similar.
The function of "winding mountain range"
"Mountaineering" is relative to Long Mai. There must be many other mountains around Long Mai, which are called Tangling Mountain. It's like there will be a guard around the master and a helper to serve him. The more people support him, the higher the status of the master. The more "tangled mountains", the more energy Long Mai gathers. We can judge where Long Mai is by the shape of "winding mountains" on both sides. The function of "winding mountains" is to "hide the wind".