The singing sand lands in western China are mainly deserts, where dunes stand like mountains. Therefore, they are also called singing sand mountains. Singing sand is also called musical sand. It is a peculiar natural phenomenon that exists in many places in the world. Influenced by various climatic and geographical factors, such as wind blows, sand slides or interactions with each other, fine sand grains dominated by quartz rotate in the airflow and the surface cavities can cause "diabolo" - a buzzing sound. The place where the buzzing sound occurs is called a singing sand land. The sand mountains are all formed by the accumulation of fine sand. They have different shapes. The sand grains have five colors, namely, red, yellow, blue, white, and black. They are crystal clear and spotless.