The main axis of the tumulus is aligned in the direction of Mount Fuji, approximately 100 kilometers away, and which can be seen from the summit of the posterior circular portion.

The anterior portion of the tumulus was demolished as landfill soil during the reclamation work of the surrounding swamps in 1937.

Investigations with a ground penetrating radar in 2016 showed that there are other unexcavated chambers in the burial mound.

The burial chamber contained a wooden coffin that was surrounded by a clay wrap resting on a layer of gravel.

[2] Due to the rich grave goods, it very likely that the buried person was a high-ranking figure who was related to the Yamato court.

[4] It is unknown if "Wowake" was a local ruler, or was someone who had been dispatched by the Yamato kingdom to rule over this year, but from the design of the tumulus and its grave goods, the connection with western Japan was very strong.