The square is situated at the gateway to the Minami Alps (Southern Alps) National Park.
It is renowned for a phenomenon where the surrounding peaks appear above the clouds, a condition locally referred to as a sea of clouds.
The location is part of the extensive Tohyamago valley, which historically served as a refuge for the Taira clan.
The stargazing conditions here are considered among the best in Japan due to the high altitude and isolation from metropolitan light.
The area is home to the rare Japanese serow and other alpine wildlife species.
Shirabiso Highlands Scenic Square is a high-altitude observation point located at an elevation of approximately 1,900 meters in the Akaishi Mountains, offering panoramic vistas of the Southern Japanese Alps. The site provides unobstructed views of peaks exceeding 3,000 meters, including Mount Kita and Mount Aino. Because of its remote location away from major urban light pollution, it is a recognized destination for amateur astronomy and night-sky observation. The square serves as a base for visitors exploring the Tohyamago region of Iida, Nagano Prefecture. A nearby facility, the Shirabiso Highlands Highland Hotel, provides lodging options for those observing the night sky. Access to the area is via mountain roads that feature dramatic inclines and dense forest cover typical of the central Nagano wilderness.
The wooden viewing platform facing the Southern Alps peaks.
Bring high-quality binoculars or a telescope for deep-sky observation.
Pack layers of clothing as temperatures drop significantly after sunset, even in summer months.
Prepare for motion sickness, as the access roads contain numerous tight hairpin turns.
Do not attempt to drive the access roads in winter without proper tire chains or winter equipment.
The access roads are typically closed during the winter season due to heavy snowfall.
Avoid using high-intensity white light flashlights at night to maintain dark-adaptation for other observers; use red-filtered lights instead.
