Very little is known about the Masuda no iwafune stone carving and definitive evidence is still lacking with regards to who built it and why. The fact that there are so many other stone slabs and structures in the area suggests that the region was inhabited prior to the Tumulus period, but again, there is no proof to support this perspective. In the end, the true origin and purpose of these enigmatic features of ancient Japan may be lost to the pages of history.
Source: https://www.ancient-origins.net/
