Why has The Classic of Mountains and Seas been called a "fantastic book" since ancient times?

Among China's ancient classics, Shan Hai Jing is a work with unique style. It has been called a "fantastic book" since ancient times. Although the book is only 365,438+0,000 words, it contains many aspects of China's ancient geography, history, myths, nationalities, animals and plants (including ecological habits, medical functions) and minerals (including origin, color, properties, etc.). ), medicine, religion, etc., and rich in information. These materials are important documents for the study of ancient Chinese history. Scholars who study the history of ancient Chinese literature, mythology, national history and medical history should study the book Shan Hai Jing.