Dewa Sanzan: A Journey of Rebirth in Yamagata Prefecture Dewa Sanzan, located along the borders of Tsuruoka, Nishikawa, and Shonai in Yamagata Prefecture, refers to the three sacred mountains: Mount Haguro, Mount Gassan, and Mount Yudono. During the Edo period, visiting these three mountains became known as a “Journey of Rebirth.” This journey symbolizes a pilgrimage through the present, past, and future. Mount Haguro – the present and prayers for happiness in the current life. Mount Gassan ...