Guida
The Narusawa Lava Trees (Narusawa Yogan Jukei) are a precious natural heritage site located in Narusawa Village, Minami-turu District, Yamanashi Prefecture, designated as a Special Natural Monument of Japan. This phenomenon occurs when lava flows engulf a forest, leaving behind hollow cavities where trees once stood after the organic matter burned away. This landscape is a testament to the dynamic volcanic activity of Mount Fuji and is recognized as an extremely rare geological phenomenon in Japan.
The history of this site dates back to the Jogan Eruption in 864 (the 6th year of the Jogan era). During this massive eruption at the northwestern base of Mount Fuji, enormous volumes of lava flowed down, swallowing the surrounding forests. As the trees were consumed by heat and gas, their shapes were preserved as hollow voids within the hardened lava. Due to its immense academic and historical value, the site was designated as a Natural Monument in 1929 and later elevated to a 'Special Natural Monument' in 1952. It remains strictly protected as a living record of nature's wonders.
The greatest attraction is the sight of the tree-shaped cavities within the lava. Specifically, regarding 'No. 11 Tree Type,' investigations in 1993 revealed it to be a 'Lava Spicule' (lava steam vent), where high gas pressure from evaporating moisture caused an explosion. This is a globally rare phenomenon, making the site of immense geological importance. From the designated viewing areas protected by chains, you can visually understand the incredible process of how lava envelops and preserves the forms of nature.
As an outdoor natural monument, the scenery changes with the seasons. From spring to summer, you can enjoy the contrast between the dark lava textures and the lush green vegetation. In autumn, the surrounding foliage becomes beautiful, highlighting the sculptural beauty of the landscape. Visiting during bright daylight hours is highly recommended, as the sunlight clearly defines the depth of the cavities and the rugged textures of the lava, making it perfect for photography.
Visitors can observe the intricate shapes created by nature up close. Observing the silhouettes of trees left in the lava and the traces of the geological 'Lava Spicule' provides a unique opportunity to learn about the volcanic history of Mount Fuji. The surrounding environment is rich in nature, allowing you to experience through your senses how the volcanic topography at the foot of Mount Fuji was formed.
The Narusawa Lava Trees are easily accessible, located along Route 139 which connects Fuji Yoshida City and the Lake Motosu area. The area is surrounded by several other natural monuments and sightseeing spots related to Mount Fuji's lava topography, such as the 'Fugaku Wind Cave' and 'Narusawa Ice Cave.' Visiting these sites together will deepen your understanding of the diverse natural landscapes shaped by volcanic activity.
Since you will be observing natural terrain, it is best to wear comfortable walking shoes and practical clothing. As this is a protected natural area, please do not touch the protective chains or fences and stay within the designated viewing areas. To preserve the environment, please ensure you take all trash back with you and follow all local-preservation rules.