Introduction to autumn scenery: There is also a legend about the origin of the Mongolian yellow elm tree. It is said that when the Antarctic Immortal, the oldest person in the list of gods, came to the sky above Xinglong Mountain, he saw the natural treasures and outstanding people here, but the sand waves tore this natural picture into pieces. After pondering for a long time, the immortal man threw the dragon-headed crutch in his hand down from the clouds and landed on the yellow sand hill. On the dune, lush Mongolian yellow elm trees grew, and the wind and sand disappeared.