Narusawa Lava Trees

Overview

Narusawa Lava Trees are a Special Natural Monument of Japan located in Narusawa Village, Minamitsuru District, Yamanashi Prefecture. In 864 AD (Jogan 6), during the early Heian period, a large-scale eruption occurred on the northwestern foot of Mount Fuji (the Jogan eruption). A massive amount of lava flowed down, engulfing the nearby forest. After the eruption subsided, the lava field left behind numerous cavities that preserved the shapes of the burned tree trunks. These are the Narusawa Lava Trees that remain today. Designated a Natural Monument in 1929 (Showa 4) and elevated to a Special Natural Monument in 1952 (Showa 27), there are a total of 12 lava trees designated as natural monuments. Each is numbered and protected by chains. In 1993 (Heisei 5), research on Lava Tree No. 11 revealed it to be a globally rare lava spiracle (a lava-steam vent) formed when the water in the lava flow turned to steam, increasing gas pressure and causing an explosion. Remarkably, it remains perfectly preserved. Narusawa Lava Trees are conveniently located along National Route 139, which connects Fujiyoshida City and Lake Motosu. They are a precious site showcasing the power of nature, appearing amidst the serene Aokigahara forest.