Introduction to mortars: The Daqingshan mortar group is the densest mortar group in the world. The mortars found in the Qingshan Scenic Area are masterpieces and wonders of nature, with different shapes, various postures, and round shapes. , nearly round, oval rows and various irregular shapes, like plum blossoms, gourds, eagle claws, and spoons. Some ice mortars are as clean as water, while others are filled with loess and covered with flowers, plants and trees, forming "natural bonsai" of different sizes and shapes, which makes people admire the uncanny workmanship of the Creator and the endless wonders of nature.