Yakehashiri Lava Flow

Overview

Yakehashiri Lava Flow, located in Hachimantai City, Iwate Prefecture, is a lava field formed by a lava flow from the middle slopes of Mount Iwate. It's designated as a Special National Natural Monument. The vast, black lava flow, stretching approximately four kilometers, feels like a journey back to the Earth's ancient past. The lack of weathering allows you to see the terrain exactly as it was after the eruption, making it exceptionally valuable. The lava flow's surface has a wavy, uneven texture, resembling tiger stripes, hence the nickname "Tiger Shape". While traditionally dated to January 1719 (Kyōhō 4, Old Lunar Calendar), recent research suggests the eruption may have occurred in 1732 (Kyōhō 17). Several vents from which the lava flowed remain on the east slope of Mount Iwate, at elevations ranging from 850 to 1250 meters. These vents are roughly 4-5 meters high and 4 meters in diameter. The locations of the first and second vents are marked on the 1:25,000 topographic map published by the Geospatial Information Authority of Japan. Because the eruption is relatively recent, the Yakehashiri Lava Flow hasn't experienced significant weathering, and the surface lacks soil, resulting in sparse vegetation and preservation of the original terrain. While lava flows aren't uncommon in volcanic Japan, the absence of topsoil and trees, along with the lack of geographical alteration, make this site scientifically precious. It was designated a National Natural Monument on November 7, 1944 (Shōwa 19), and elevated to Special National Natural Monument status on March 29, 1952 (Shōwa 27). It's also designated as a Special Protection Area of Towada-Hachimantai National Park, established in 1956 (Shōwa 31). A roughly one-kilometer observation trail has been built at the end of the lava flow, allowing for free access except during winter when it's closed due to snow. At the trail's end stands a monument with a poem, "Yōganryū" (Lava Flow), written by the famous author Kenji Miyazawa, who visited this site. Yakehashiri Lava Flow offers a unique opportunity to experience the power and beauty of nature. We highly recommend a visit.