The name 'Senjōjiki' translates to 'a thousand tatami mats,' referring to the vast, flat-like area of the cirque floor.
The cirque floor acts as a natural alpine garden with over 150 species of flowering plants.
The Komagatake Ropeway provides an elevation gain of 950 meters in approximately 7.5 minutes.
The basin is surrounded by 2,900-meter peaks that remain snow-capped well into the summer season.
The area is home to the Japanese rock ptarmigan, a bird species designated as a Special Natural Monument in Japan.
Senjōjiki Cirque is a glacial basin located at an altitude of 2,612 meters in the Central Alps of Nagano Prefecture, Japan. It was formed by the erosion of glaciers during the last ice age, creating a distinct bowl-shaped topography. The area serves as the primary trailhead for the ascent of Mount Hōken and Mount Kiso-Komagatake. Visitors access the cirque via the Komagatake Ropeway, which transports passengers from the Shirabidaira Station to the Senjōjiki Station at the edge of the basin. The region is known for its high-alpine vegetation, including rare wildflowers like the creeping pine and various alpine flora that bloom from July to August. Snow typically lingers in the cirque until early summer, allowing for late-season skiing and snow trekking. The site is part of the Chūbu-Sangaku National Park region.
The wooden boardwalk near the Senjōjiki Station, looking back toward the jagged silhouette of Mount Hōken.
Wear high-quality, broken-in hiking boots, as the trail loop consists of uneven volcanic rock and loose gravel.
Bring layers regardless of the season, as temperatures at 2,600 meters are significantly lower than in the valley.
Apply high-SPF sunscreen, as UV radiation is intense at this altitude.
Attempting the ascent to the summit without proper mountain gear or weather monitoring, as conditions change rapidly.
The ropeway may suspend operations during high winds, lightning, or severe winter blizzards.
Stay strictly on marked trails to avoid damaging sensitive high-alpine tundra vegetation; pack out all personal waste.
