What does the mountain doctor mean by the mountain of divination?

This "mountain" refers to geomancy, that is, "seeing Feng Shui".

The five techniques of Qihuang in ancient Chinese medicine-mountain, medicine, life, physiognomy and divination-include the secret techniques of self-cultivation and physical exercise. In ancient times, most monks chose to practice in the quiet mountains, which is the origin of the word (mountain).

The other four techniques of Qihuang in ancient Chinese medicine are:

Medicine-including the secret technique of treating diseases, which is different from modern medicine. (Mountain) and (Doctor) are secretaries who seek to get rid of the four inevitable pains of life (life, old age, illness and death).

Fate ── includes the skills to understand human beings, transform their destiny, and make them know their destiny and do their best.

divination-contains the secret technique of predicting the situation and dealing with it accurately.

physiognomy-it contains the secret of observing things to make choices.