Mount Yudono (湯殿山 Yudono-san) is one of the Three Mountains of Dewa in the ancient province of Dewa (modern-day Yamagata prefecture). The Yudono-san Shrine, the most holy of the Dewa Sanzan shrines, is sited on the mountain. Pilgrims have to enter the shrine itself barefoot, and photography is not allowed. Due to heavy winter snowfall, the mountain and shrine are inaccessible for long periods of the year.