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Nikko NP, Tochigi
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Local accounts credit a wartime horse pasture with helping Happogahara’s azaleas spread: horses grazed on many plants but left the poisonous rengé-tsutsuji behind. Today, about 200,000 plants brighten the plateau.
Happogahara’s volcanic landscape supplied more than scenery: its obsidian was used to make Paleolithic tools, and Takahara obsidian has been found across the Kanto region. Archaeologists also found tool-making sites high on nearby ridges.
Nearby Oshiraji Falls can disappear when its stream runs low. After rain, sunlight filtering through the trees can illuminate its blue pool—a striking combination that helped earn the waterfall its “phantom” reputation.
At Komama, a towering Japanese azalea called the “Komama Queen” spreads its branches about 7 m wide while standing roughly 4 m tall. Its nickname was coined by a local photographer who followed the area’s blooms.
Happogahara is a series of broad, step-like shelves formed by ancient lava flows—not one level tabletop. From lower to higher, the terraces are named Gakkodaira, Komama and Omama.
The azalea season moves uphill in stages: flowers appear around the forest office in April, then at Komama and Omama in May and June. Different species bloom along the way, so spring unfolds as a floral relay.
Cattle still graze on the plateau. On June 5, 2026, local farmers turned 27 breeding cows out onto a 78-hectare pasture; the highland’s cool summers help keep the animals comfortable while they graze.
The famous azalea landscape needs care: deer browse the plants, while shrubs and trees can gradually crowd the open ground. Yaita installed a deer-exclusion fence, and the national park’s plan calls for maintaining the grassland and azalea community.
