Guide
Shiranuta no Osugi is a monumental Japanese cedar designated as a Natural Monument of Shizuoka Prefecture. Located at an altitude of approximately 700m in the Mt. Amagi mountain range of Higashi-Izu, Shizuoka, this tree boasts a height of about 40m and a circumference of 10.5m. It stands as a symbol of strength, deeply rooted in the fertile environment of the Amagi mountains. This site is far more than just a display of a single giant tree; it is part of a highly precious ecosystem that includes the nearby Shiranuta Pond. The area is surrounded by a primeval forest of cedar, fir, and Japanese beech, offering a glimpse into the untouched, original landscapes of Japan.
The geological structure of this area is closely linked to the ancient crater of the Amagi volcano, resulting in a unique terrain shaped by natural forces. Shiranuta no Osugi has been historically protected as one of the representative giant trees of the Izu Peninsula, often mentioned alongside the famous 'Amagi no Taro Sugi' and 'Amagi no Jiro Sugi.' The adjacent Shiranuta Pond is a dammed lake formed by debris flows, a key element that has shaped the local environment for centuries. Due to this significant geological and historical value, the area is managed as a scientific reference forest to preserve its natural state.
The main highlight is the overwhelming presence of Shiranuta no Osugi itself. Its straight, soaring form stands out strikingly against the surrounding greenery. Nearby, you will find Shiranuta Pond, a calm body of water roughly 40cm deep, surrounded by a diverse array of flora and fauna. The area features plants like Japanese maple and Alnus japonica, which change beautifully with the seasons. This area is a treasure trove of biodiversity, offering a rare chance to observe various bird species, insects, and even the rare Morihiki frog in their natural habitat.
The landscape changes dramatically with the seasons. From spring to summer, you can enjoy vibrant fresh greenery and active wildlife around the pond. In autumn, the deciduous trees, including Japanese maples, turn brilliant colors. Winter offers a serene, quiet landscape of leafless trees. For the best experience, visit in the morning when sunlight filters through the canopy, highlighting the textures of the trees and the clarity of the pond. However, please be aware that the mountainous terrain often experiences sudden fog and changing weather.
This is a destination for quiet nature observation rather than high-energy activities. As a scientifically precious forest, the focus is on forest bathing (shinrin-yoku) and observing rare plant and animal life in a peaceful environment. Observing the seasonal changes in vegetation around the pond is a deeply rewarding experience for nature enthusiasts. We ask that all visitors maintain silence to respect the delicate ecosystem.
The Mt. Amagi area offers many other natural wonders. You can combine your visit with other nearby natural monuments, such as the Hosono Wetlands, to create a complete nature tour of Shizuoka's landscapes. Additionally, the Higashi-Izu area is famous for its many hot spring (onsen) resorts, making it perfect to relax in a hot spring after your forest trek.
Shiranuta no Osugi is located within a national forest, and prior permission is mandatory to enter. Please apply to the Izu Forest Management Bureau in advance. Regarding clothing, we strongly recommend sturdy, non-slip footwear (such as trekking shoes) as you may encounter unpaved paths, steep slopes, or damp ground. Since this is a mountainous area, bring waterproof gear, warm layers, and insect repellent to prepare for weather changes.