A rare salt karst formation has been discovered in northwestern China's Xinjiang Uygur Autonomous Region on May 11.<br /><br />The spectacular video shows the incredible scene of the first salt-dissolved karst landform in the region. A karst formation is shaped when soluble minerals are dissolved over time to form unique rock formations and can form caves, cliffs and sinkholes. <br /><br />An engineer from the Bureau of Geology and Mineral Resources said it was the first time he saw the landform in his 25-year career.