Senjogahara in Oku-Nikko is an expansive wetland covering about 400 hectares. In summer, the area becomes particularly stunning with the blooming Spiraea salicifolia, creating a picturesque scene with Mount Nantai in the background. Visitors can stroll along the wooden walkways, observing seasonal flowers and birds, making it a favorite spot for nature walks and hiking enthusiasts. The Spiraea salicifolia typically reaches its peak bloom from mid-July to mid-August, providing a fresh and delightful summer landscape unique to Oku-Nikko.

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