Kamihirakawa Otsuka Tomb

...There are also other famous tombs, such as the Koryo-Otsuka Tomb, which is also known as the Shinyama Tomb.
[Kamihirakawa Otsuka Tomb]
A keyhole-shaped tumulus from the late 4th century located in Kamihirakawa, Ogasa-cho, Ogasa-gun, Shizuoka Prefecture. Traces of the tumulus remain in the middle of a rice field, but it has been so destroyed that it is impossible to determine its original shape.

*Some of the terminology used in reference to the Kamihiragawa Otsuka Kofun is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…なおほかにも，広陵大塚古墳のように，新山（しんやま）古墳の別名で有名なものがある。
【上平川大塚古墳】
　静岡県小笠郡小笠町上平川にある4世紀後半の前方後円墳。水田中に墳丘の跡を残すが，破壊がはなはだしく，原形を推定できない。…

※「上平川大塚古墳」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報