They are the Emperor's capital below. "In other words, the Kunlun Mountains were the Emperor of Heaven's capital on earth. In Kunlun there were not only elixirs of immortality and the tree of longevity, but also beautiful hanging gardens where both flowers and vegetables were grown, and which are seen as the earliest model of a Chinese garden.
《山海經》記載「海內昆崙之墟在西北，帝之下都」，認為昆崙乃天帝在地上的都城，境內除了不死藥、長生樹，還有兼具花園、菜圃功能的美麗「懸圃」，被視為中國最早的園林模型。