Introduction to Goose Guanlin and Gooseguan King: "Goose Guanlin" overlaps one another and hangs upside down in the air. Its scientific name is "goose tube", and the density of goose tubes here is the highest in the world. The longest goose pipe is 2.5 meters long and is called the "King of Goose Pipes". A goose tube only grows 2 centimeters in 100 years. This king goose tube takes at least tens of thousands of years to form.