Nakaoyama

Mounded Tomb

A Hidden Clue

to Japan’s Imperial Succession

Tucked away in the quiet countryside of Asuka, the Nakaoyama Mounded Tomb dates back to the late 7th century and is believed to be the possible burial site of Prince Otsu, the ill-fated son of Emperor Tenmu. Excavations have revealed a distinctive octagonal burial mound—an architectural rarity used exclusively for high-ranking royals during this era. Its structure and scale suggest deep political significance, potentially tied to imperial succession conflicts following Emperor Tenmu’s reign. Although lesser-known than neighboring tombs, Nakaoyama offers rare insight into Japan’s turbulent Asuka Period, making it a must-visit for travelers seeking a deeper narrative of ancient Japanese royalty and its buried secrets.

Explore the Sights

See photos that bring Nakaoyama Mounded Tomb to life.

A large ancient grave mound surrounded by a wooden fence, with a tall stone marker inscribed with Japanese characters in front, under a canopy of green leafy trees.
An ancient, moss-covered stone mound surrounded by a black wooden fence in a forest with dense green trees overhead.
A hillside with grass and small plants, trees in the background, and leafy branches framing the top of the scene.
An ancient burial mound surrounded by a black wooden fence, located in a park with trees and green foliage.
A grassy mound with trees and leafy branches overhead, under a blue sky.
A grassy mound surrounded by a black fence in a wooded area with trees and green leaves.