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Chubu-Sangaku NP, Nagano
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At the park’s wind cave, cold air breathes out between rocks; guides say it can stay below 8°C even in midsummer, with snow sometimes lingering in the crevices. It’s a natural cooler between the Mizubashō and Watasuge marshes.
At the park entrance, Tsugaike Sanso serves soft-serve made with Otari’s tangy sarunashi, often nicknamed “baby kiwi.” This small local fruit brings a sweet-tart taste of the village to the alpine trailhead.
Sankayō’s white petals can become glass-clear when wet, earning it the nickname “skeleton flower.” Tsugaike Visitor Center staff think it may happen more often near the end of flowering, when aging petals take up water—but the right conditions still have to come together.
One late-summer find is kurobanarouge, a dark wine-colored marsh cinquefoil. The local park map says Tsugaike is the only place in Nagano Prefecture where it can be seen; its subdued color makes it easy to overlook among brighter flowers.
Cold slows decay so much that peat builds at roughly 0.5–1 mm a year. As a high bog rises above groundwater, rain becomes its only water source—and its nutrient-poor soil suits specialists such as sundews.
A little round island of plants and peat appears to float in the pond at Ukishima Marsh—and gave the marsh its name. On calm days, Mt. Shirouma reflects in the pond beside it, creating one of the park’s most distinctive scenes.
The name has a botanical clue: local people traditionally called the abundant Abies mariesii fir “tsuga,” and likened the broad wetland to an “ike,” or pond. The fir also bears striking blue-purple cones, sometimes about 10 cm long.
At the 1,860-metre Mizubashō Marsh, skunk cabbage can bloom into late June and early July, with snow still nearby. Local guides describe Tsugaike’s display as the latest-blooming on Honshu—a reminder that spring arrives slowly up here.
Until 1993, vehicles could reach the nature park entrance. Concern about exhaust led to ending road and bus access in 1994 and switching to a ropeway—a conservation-minded change for a delicate high-altitude wetland.
The red-roofed former Tsugaike Hut was built in 1933 as a 3-story wooden lodge for Northern Alps climbers. When a replacement was built, the original was preserved; in 2002, Otari Village made it a memorial museum.
The green-gray strands hanging from trees are saru-ogase, a lichen visible from the trails and gondola. The local guide explains that it uses moisture from mist and photosynthesis to grow—a curious sight to spot along the way up.
