Shichikoyama Kofun
This ancient tomb is believed to date back to the 6th century.
It's planted with cherry trees, making it a scenic spot.
There was an entrance leading up the mountain. 🚪 What surprised me was the numerous stone statues just after the summit, all of which had their heads removed.
It's unclear when they were destroyed or whether they were for religious purposes, but they were in a strange state.
The stone statues at the summit showed signs of repair.
It takes about 30 minutes to walk around the entire tomb.
The stone chamber appears to have not been discovered.
Fujioka City
Shichikoyama Kofun is a three-tiered keyhole-shaped tomb built in the first half of the 6th century. It is one of the largest 6th-century tombs in eastern Japan, measuring 150 meters in length, 115 meters wide at the front, 85 meters in diameter at the rear, and 16 meters high at both the front and rear.
The excavated artifacts include cylindrical haniwa, morning glory-shaped haniwa, figurative haniwa of people and horses, as well as Sue ware and Haji ware. The cylindrical haniwa in particular is a rare large item, measuring 40 centimeters in diameter and 110 centimeters in height, with seven protruding bands around it.

Sorry for the sudden question, but do you think that all keyhole-shaped tumuli are the same shape, even though they may vary in size?
That's not true. In fact, just like fashion, shapes go through trends and outdated styles (lol).
Shichikoshiyama Kofun, which appeared at the end of the Kofun period in the first half of the 6th century, had an avant-garde shape that was the first of its kind in this region, and it showed off to the surrounding powerful clans that it was a "fashionable keyhole-shaped tumulus" (lol) imported directly from the central government.
What exactly is different? It's actually the balance between the front and rear circular sections that's completely different.
Right nearby is Shiraishi Inariyama Kofun, a keyhole-shaped tumulus built a century earlier and roughly the same size at about 150m, so let's take a look at the difference in proportions.
First of all, Shichikoshiyama Kofun has a small face, deep carvings, and a sleek style. (lol) Specifically, the circular section is smaller than the square section, and the mound is higher.
Numerically, the circular section is 87m wide and the square section is 106m wide, making the square section wider, and at 16m high, it's the same height as the circular section.
On the other hand, the Shiraishi Inariyama Tomb, the model from 100 years ago, has a larger face with a circular section 92m wide and a square section 86m wide, and a shorter nose with a circular section 13.5m high and a square section 8.5m high.
The newer the keyhole-shaped tomb, the larger the square section tends to be, and Shichikoshiyama Tomb is the ultimate example of this. To eyes accustomed to the keyhole-shaped tombs that came before, it must have seemed strange.
The source of this trend is the Haji Nisanzai Tomb, believed to be the tomb of the Great King, located in the Mozu Tomb Group in Osaka.
It is a huge tomb with a mound length of over 300m, but what's interesting is that Shichikoshiyama Tomb is not just "similar," but is an exact replica.
This isn't just a case of imitating something you see and thinking, "It seems like this kind of shape is popular in the city..." The deceased of Shichikoshiyama Kofun holds a thick pipe in the center, suggesting that blueprints were provided and engineers were dispatched.
The scale is half to match the national power, but I imagine the deceased was proud of the state-of-the-art style and boasted to those around them (lol).
It's only about a 10-minute walk, so be sure to visit both the Shiraishi Inariyama Kofun and the Shiraishi Inariyama Kofun to enjoy the difference in their shapes.
According to a pamphlet from the Fujioka Historical Museum,
Shichikoshiyama Kofun is a keyhole-shaped tumulus built in the first half of the 6th century, making it one of the largest tumuli from that period in eastern Japan. Furthermore, a ground-penetrating radar survey conducted in 2018 revealed that the tumulus is approximately 150 meters long and that the rear circular mound contains a horizontal stone chamber measuring nearly 20 meters in length, making it one of the largest horizontal stone chambers in eastern Japan.
Furthermore, the cylindrical haniwa (clank haniwa) unearthed during previous excavations are extremely large, measuring over 40 cm in diameter and over 1 meter in height. Such large cylindrical haniwa with multiple protruding bands are said to be rare and found only in a limited number of kofun in Gunma Prefecture.
This was my second visit to see a real keyhole-shaped tumulus, following the Shiraishi Inariyama Kofun we saw earlier. This one is obscured by trees, so its keyhole shape is difficult to appreciate unless viewed from above. Shiraishi Inariyama Kofun appears to have been built on a hill, but this one is built on flat ground, making it feel even larger. It's mind-boggling to think that it was built by human labor. It couldn't have been done unless the country was rich and many people lived there. I wonder if they were paid wages. I wonder what kind of lives the people led at that time.
This one was also overgrown with weeds, but we were able to follow the footsteps of people and reach the top of the kofun. However, it is obscured by trees, so although it is quite high up, the view isn't great, and even from here it's hard to tell that it's shaped like a keyhole.
I visited Shichikoshiyama Kofun, featured on the TV program "Kofun no Jidai," because the cherry blossoms were so beautiful. 🌸
This kofun is the largest and tallest I've ever visited.
★I've only ever seen Tenjinyama Kofun, the largest in eastern Japan, from the road in my hometown of Ota City, so I'd like to visit it by mountain bike someday.
There were more cherry blossom-viewing visitors than I expected, and the cherry blossoms were near full bloom, so I was lucky to visit!♪
[Reference]
Gunma Prefecture is home to many gigantic keyhole-shaped tombs, some even surpassing those in the Kinai region. Shichikoshiyama Kofun in Fujioka City, Gunma Prefecture, is said to be the burial site of Kamitsukeno no Okuma, a powerful local clan leader from the early 6th century.
There's a parking lot at the Shichikoshi Gate, and although it's close, I thought it was the temple's parking lot, so I parked at the Fujioka History Museum and walked there. ^^;
The tumulus isn't designed so that you can walk around it in one go, so you end up returning the same way.
There are a row of headless Jizo statues (?) near the entrance, and a headless Kannon statue (?) at the top of the mountain. It might be a little scary to go alone. I'd like to go during cherry blossom season.