Kamenokoyama Kofun, Keyhole-shaped burial mound in Denenchofu, Japan
Kamenokoyama Kofun is a keyhole-shaped burial mound located within Tamagawadai Park, measuring roughly 100 meters in length. The structure combines a circular rear section with a rectangular front portion, creating its distinctive profile.
The mound was built during the late ancient period and stands as one of the region's oldest archaeological structures. It emerged from an era when such monumental burial constructions were central to society.
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 site is easily accessible from Tamagawa Station and sits within a public park with free entry. Visitors should wear sturdy shoes, as the terrain can be uneven and views are best enjoyed from different vantage points around the grounds.
The site's name comes from its unusual shape that resembles a turtle when viewed from the side. Despite its impressive size, no clay figurines or stone coverings have ever been found within the burial chamber.
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