The park's name refers to the 'Tsukinoishi' (Moon Stone), a geological formation found within the site.
The area is part of the Prefectural Nagatoro-Tamayodo Natural Park system.
The crystalline schist found here is approximately 80 to 90 million years old.
The park is specifically managed for its density of Japanese maples, which reach peak color typically in mid-November.
Lunar Stone Maple Park, locally known as Tsukinoishi Momiji Park, is a riverside garden in Nagatoro specifically designed to highlight Japanese maple trees against a backdrop of natural rock formations. The park features a landscape of crystalline schist, a rock type central to the local geology of the Arakawa River valley. During autumn, the park is illuminated at night to showcase the intense foliage color. The grounds offer an integrated path system that winds between the stone boulders and the riverbank. It serves as a designated viewing area for the autumn color changes typical of the Chichibu region.
The central observation area where the red maple leaves frame the reflection of the rock formations in the Arakawa River.
Bring a tripod if visiting during the evening illumination period, as lighting levels are low.
Wear sturdy walking shoes with good grip to navigate the uneven, rocky terrain near the water.
Visit on a weekday to avoid the significant crowds that congregate during the peak autumn foliage season.
Do not attempt to swim in the river near the park as currents can be unpredictable.
The park remains open year-round, but specific night-time illuminations occur only during the autumn peak season.
Stay on the designated gravel and paved paths; do not climb on the protected geological rock formations.
