
Dewa Sanzan is in the northern Tohoku region of the main Japanese island Honshu.
Hagurosan is accessible all year round, but Gassan and Yudonosan close during winter because of snow. The peak climbing season is short and extends only from July to mid-October. Festivals are held to celebrate the opening and closing of the shrines.
The traditional approach is to hike across all three mountains, although most visitors opt for a bus from Hagurosan to Gassan as the distance is quite long.