Kamenokoyama Kofun, Keyhole-shaped burial mound in Denenchofu, Japan
Kamenokoyama Kofun is a keyhole-shaped burial mound inside Tamagawadai Park in the Denenchofu area of Tokyo. It has a rounded rear section connected to a rectangular front portion, which together give the mound its recognizable outline.
The mound was built during the Kofun period, roughly between the 3rd and 7th centuries, when this type of burial construction was common across Japan. It is one of the oldest surviving structures in the area.
The mound reflects ancient burial customs and the social status of those interred within it. The scale and design of the structure demonstrate how communities honored their most important members.
The mound sits inside Tamagawadai Park, which is easy to reach from Tamagawa Station on foot. Sturdy shoes are helpful, as the ground around the mound can be uneven in places.
The name Kamenokoyama means turtle hill in Japanese, referring to the shape the mound takes when seen from the side. Despite its size, no haniwa clay figures or stone coverings have ever been found at the site.
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