The Dewa Sanzan are very holy to both the religions of Shintō and Buddhism, but in particular are very significant and sacred to the shugendō religious system of beliefs, as they represent great spiritual significance. Mount Haguro, Mount Gassan, and Mount Yudono each have their own shrine, though the primary shrine itself, Dewa Shrine, is located at the summit of Mount Haguro. The primary shrine is unique in that it venerates all three sacred mountains.