Yol valley is one of the natural wonder of Gobi Gurvan Saikhan National Park and beautiful deep canyon with many rocky cliffs, has been created by many years of water erosion. The Yoliin Am, a protected site in 1965, is 62 km north west of Dalanzadgad. Very wide at the entrance, it narrows gradually into a remarkable gorge. A spring 2 or 3 km long winds its way through the defile and in July, freezing into a thick corridor of ice that stretches along a considerable distance. In earlier times, the blocks of ice rarely melted, being protected from the vicious sunlight. This, however has changed in recent years, partially because of the multitudes of tourists that walk on the ice. You can still see ice here in July but it is almost completely melted by August. Following the canyon to the very end, one emerges into a beautiful wide valley. Surrounding mountains are home to argali, ibex, and many birds of prey, as well as numerous small rodents particular to the Gobi. A small museum marks the entrance to the protected zone and provides information on the petrified trees, fauna and flora of the Gobi.