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Myōkō-Togakushi Renzan NP, Niigata
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On calm days, Tengu-no-Niwa’s small pools mirror Mt Hiuchi, with alpine flowers around them. One marsh view can hold the mountain twice: on the skyline and again in the water.
A ranger’s July 25, 2023 visit caught cotton grass at its fluffy peak, while four-leaf lousewort and yellow hana-nigana bloomed beside the boardwalk. The marsh’s midsummer show has more than one star.
Look for カオジロトンボ (kaojiro-tonbo), a black-bodied dragonfly a ranger recorded here. It is found only in Hokkaido and Honshu’s mountains; reddish marks at the wing bases help distinguish it from familiar akane dragonflies.
The high moor around Tengu-no-Niwa and nearby Takayaike is a breeding area for 3 amphibians, including the Japanese black salamander and forest green tree frog. These pools are nurseries as well as flower habitat.
Sediments in Tengu-no-Niwa and nearby marshes preserve several ash layers identified as products of Mt Yakeyama. This flower-filled wetland also holds a record of eruptions from the neighboring volcano.
Myoko’s 2020–24 conservation plan reported that Tengu-no-Niwa’s wetland was shrinking year by year, and called for surveys and countermeasures. Even this high mountain landscape needs active care.
