Introduction to Cass Canyon: Cass Canyon is long, narrow and deep. The valley platform is 3800 meters above sea level, and the valley bottom is 2900 meters above sea level. The valley is densely covered with forests, jagged rocks, flying springs and waterfalls, and the roar is loud. The mist in the valley changes unpredictably, and the rock peaks of different shapes appear and disappear. Sometimes they look like heavenly palaces, sometimes like fairies descending to earth, and sometimes like celestial horses flying in the sky. It is really a spectacle.