I biked north from Habikino City Hall, and after finding the worship place of the Ichinoyama Kofun (Emperor Ingyo's Mausoleum) in a maze of residential streets, I also stopped by this "Higashi Umazuka Kofun" just to the east. It's said to be a "baichō" (satellite tomb) built as if nestled up against the huge Ichinoyama Kofun, and it's a compact square kofun about 23m in total length. Right next to an emperor's mausoleum so big it's hard to grasp its full shape, this one is sized so you can tell at a glance that it's "square," which is fun. The surroundings are neatly landscaped with lawn, and it stands on its own like a green oasis in the middle of the residential area. There's no tourist parking, and it's a hard place to get into by car, but by bike you can quickly stop by as part of a loop around the Ichinoyama Kofun. It was a lovely discovery only possible on a bike tour, letting you enjoy the combination of a giant kofun and a mini kofun.

A kofun surrounded by houses and a park that looks newly built. In the aforementioned park, there's an information board for this kofun along with one for the Futatsuzuka Kofun, but the content is very thin. The mound has some grass growing on it, and perhaps because of that, vines are wrapped around the park's wire fence. You can see a stone marker indicating that it's a satellite tomb designated by the Imperial Household Agency, but the path (the area circled in yellow in the 5th photo) was blocked off. I wonder why.

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It sits small and quiet at the back of the tennis court parking lot. It's a square kofun 30m on each side and 3.5m high, and is detached plot "I" of Emperor Ojin's Mausoleum. The stone marker standing on the mound says Imperial Household "Ministry" ("省"), which made me feel it's from a while back. A surrounding moat and a row of haniwa have been confirmed, and its construction date, the first half of the 5th century, is roughly the same as Emperor Ojin's Mausoleum. However, it was built on top of the outer embankment of Emperor Ojin's Mausoleum that once existed, which is unnatural compared to the others. So, like the Futatsuzuka Kofun, it may have been built a little earlier than Emperor Ojin's Mausoleum. A line showing where the outer embankment was is drawn in the aforementioned tennis court parking lot.

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A satellite tomb of Emperor Ojin's Mausoleum. It's a square kofun about 30 meters on each side, thought to have been built in the first half of the 5th century. It's between a tennis court and houses. It's hard to spot, and I almost walked right past it. I went around to the back too, but the view was the same as from the street. For some reason, the information board for this kofun is on the tennis court fence... and you can't even get in... Why put the board in such a spiteful-looking spot? Zero sense in where they installed it... I'm appalled.　　Addendum: I'm reposting only the photo of the information board and the photo of the kofun from the tennis court side.

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A square kofun that's a World Heritage Site. It's surrounded by a wire fence.