A nationally designated natural monument, the Yakehashiri Lava Flow is an enormous stretch of land (3 km in length and 1 km in width at maximum), covered in lava that was first spewed out from Mt. Iwate in the early half of the 18th century. Across over 200 years, its terrain has remained largely unchanged by erosion and plant growth, with trees and shrubbery sparse even to this day, making it a target of fascination for scholars.
However, you can experience it firsthand too, with the walking trail that runs right through it!