The name 'Koyodai' translates to 'Red Leaf Hill,' referring to the intense autumn coloration of the surrounding deciduous forest.
The observatory is built on a volcanic hill formed by ancient lava flows from Mount Fuji.
From the top, you can see the contrast between the vast, dark Aokigahara lava forest and the stark white peak of Mount Fuji.
The viewpoint is situated on the edge of the expansive volcanic plateau that extends from the northern base of the mountain.
Koyodai Observatory is a vantage point located on a 1,165-meter-high hill in Narusawa, known for its unobstructed panoramic views of Mount Fuji and the Aokigahara forest. The summit features a multi-story observation deck that provides a 360-degree perspective of the Fuji Five Lakes region. Several hiking trails originate from the base, connecting the observatory to the nearby Aokigahara Jukai (Sea of Trees) and Narusawa Ice Cave. The site serves as a prime location for observing the changing foliage of the surrounding dense woodland. It is situated on a ridge that separates the northern and southern views of the Yamanashi prefecture landscape. The facility remains a recognized historical lookout point in the Fujikawaguchiko area.
The top level of the wooden observation tower, which provides the highest vantage point for framing Mount Fuji above the tree line.
Wear sturdy hiking boots if you plan to explore the trails descending into the forest.
Bring a light jacket, as the altitude and wind at the top can make the temperature significantly cooler than in the valley.
Use binoculars to spot wildlife or specific geological features within the Aokigahara forest canopy.
Do not attempt to hike the forest trails without proper navigation tools or markers, as the dense canopy can be disorienting.
Stay on marked trails to protect the volcanic soil and native vegetation.
