It was very difficult to rank the famous mountains and immortal caves in prehistoric novels because each novel had its own unique worldview and setting. The authors would also modify and create the plot according to their own preferences. However, according to the descriptions of some prehistoric novels, some famous immortal caves could be roughly ranked. These rankings were usually determined by some settings and plots in the novel. The following are some rankings of famous mountains and immortal caves that might be applicable to most prehistoric novels: Yaotai Immortal Cave-Located on the shore of the West Sea, it is one of the most powerful immortal caves in the Primordial World. It has many high-level immortals and gods. The Purple Cloud Immortal Cave was located above the Heavenly Palace and was one of the most famous immortal caves in the Primordial World. It had many immortals and Heavenly Emperors. 3. Nanhua Immortal Cave-Located on the coast of the East Sea, it is a mysterious immortal cave in the Primordial World. It is said that there is a famous immortal, Nanhua Zhenren. 4. The Great Void Immortal Cave is located in the void. It is one of the most powerful immortal caves in the Primordial World. It has many high-level immortals and gods. 5 Primordial Chaos Immortal Cave-located in the center of the universe, it is one of the most mysterious immortal caves in the Primordial World. It is said to have infinite time and space. 6 Long-Browed Immortal Cave-Located at the top of Mount Hua, it is a mysterious immortal cave in the Primordial World. There is a famous immortal, Long-Browed Immortal. 7 West Ocean Immortal Cave-Located on the shore of the West Ocean, it is a famous immortal cave in the Primordial World. It has many high-level immortals and gods. It should be noted that these rankings were based on the setting and plot of some novels, and were not absolute. Different authors might make different modifications and creations to the plot and setting of the novel, so the ranking would be different.