All 18 chapters can be classified into 4 categories: Classic of the Mountains (contents 5 chapters), Classic of the Seas (contents 8 chapters), Classic of the Great Wilderness (contents 4 chapters), and Classic of Regions Within the Seas (contents 1 chapter). It recorded more than 100 diplomatically related realms, 550 mountains and 300 rivers, along with the geographic and cultural information of the nearby realms. The Classic of Mountains and Seas also recorded up to 277 different animals. Scholars believe the records of animals in Classic of the Mountains are somewhat exaggerated due to the long history of people compiling them in different dynasties; yet they still have a certain degree of authority, because they were generally written by sorcerers and Fangshi ("method masters") based on the experiences they gained from their trips.