Nasu Ogawa Kofun Cluster - Credit: Wikimedia Commons
The is the collective designation for three separate groups of kofun burial mounds located in the town of Nakagawa in Tochigi Prefecture in the northern Kantō region of Japan. The Komagata Ōtsuka Kofun within this cluster received protection as a National Historic Site in 1979, and the other groups were added in 2002. Read more on Wikipedia
Source: en.wikipedia.org