Dewa Sanzan, the Three Mountains of Dewa, comprised of Mt.Haguro, Mt.Gassan and Mt. Yudono. The deities of all three mountains are enshrined at Sanjin Gosaiden on the top of Mt. Haguro which is accessible all year round. The shrines on Mt. Gassan and Mt. Yudono are inaccessible during winter due to heavy snow.
Sanjin Gosaiden was most recently rebuilt in 1818 due to numerous fires. At the end of the ascent of the stone stairway, the vivid red shrine stands proud at 28.2m high. The shrine has a 2.1m thick thatched roof and is one of the largest wooden building with such a roof in Japan.