Introduction to Yizitian: Yizitian is located on the steep wall on the south side of the north peak of Parrot Cave. It is a crack in the rock cliff caused by the crustal movement. It is the only way to climb to the seventh heaven and fly to the ninth heaven of Wuliangguan Beishan. Because when you look up at the crevice, the blue sky forms a "one" shape, so it is named "One-Character Sky". There are more than a dozen ancient dwarf pines growing on the rocks on the cliff, which are called "green on the top of the stone".