The Yarlung Tsangpo Grand Canyon stands unrivaled as the world's deepest, reaching a staggering maximum depth of 6,009 meters—more than three times the depth of the iconic Grand Canyon in the United States (approx. 1,829 meters). Often described as the "last secret place on Earth," it serves as a critical moisture corridor for the Tibetan Plateau. The canyon features an extreme vertical ecological gradient, transitioning from glacial landscapes to tropical rainforests. This unique geography allows for a complete climatic shift—from arctic to tropical—all within a single canyon, hosting a level of biodiversity rarely seen at such high altitudes.