01 / Hirano Tsukaanayama Kofun
The chamber of cut tuff blocksis carefully polished throughout its interior.

Hirano Tsukaanayama Kofun is a national historic site on the northeastern foot of Mt. Nijo. The Agency for Cultural Affairs describes the main chamber as built of cut tuff blocks, with 21 small cut stones on the floor of the burial chamber, one stone for the back wall, two for each side wall and two for the ceiling. It is said to show one aspect of the final phase of the Kofun period.
- National historic site, 1973
- 21 cut stones on the chamber floor
- Interior entirely polished
