I Looked Into Oshitoishi no Oka Campground

On this blog, I'm gradually researching and recording campgrounds that seem reachable without a car.

This time, I looked into Oshitoishi no Oka Campground, located in Minamioguni, Kumamoto Prefecture. I came across mentions somewhere of it being a power spot called the 'sacred site of the Jomon era,' with a 360-degree view you can enjoy from there, and even as an indoor type, I got curious enough to check out the official website and other sources.

What Kind of Place Is Oshitoishi no Oka, the "Sacred Site of the Jomon Era"?

Oshitoishi no Oka is apparently a spot where stones of various sizes are scattered across a hill at an elevation of 845 meters in Minamioguni, Aso District, Kumamoto Prefecture. It seems to have been designated a scenic spot by the town, and it's introduced as a power spot known as the "sacred site of the Jomon era."

What stands out most is the largest stone, said to be pyramid-shaped, standing 5.5 meters tall with a circumference of 15.3 meters. According to legend, it's also known as "the stone the demons used for their juggling game," which gives you a sense of just how massive it is. The large rock is said to bear engraved patterns (petroglyphs) believed to be Sumerian characters from around 4,000 years ago, and it's apparently been discussed by the Japan Petroglyph Society and rock art societies overseas. That said, there seem to be various opinions about its academic standing, so it's probably worth keeping that in mind.

There also seem to be several other notable stones, such as the "Scissors Stone" (said to mark the point where the sun rises at the summer solstice and sets at the winter solstice, believed to function as an ancient sundial), the "Mirror Stone" (said to have engravings believed to be Sumerian characters), and the "Altar Stone" (said to lie along the line where the sun rises at the summer and winter solstices). It sounds like a place where you could enjoy walking around the whole hill to visit each one.

Admission is apparently 300 yen for high school students and older, free for younger visitors, with a simple pricing structure of 500 yen per person for camping. Opening hours seem to vary depending on the source, with some listing 8:30 to 17:00 and others 9:00 to 17:00. Regarding closed days, some sources say it's open year-round while others say it closes only at the end of the year, so there's some ambiguity there — it's probably worth confirming before you visit. There also seem to have been cases of temporary closures or cancelled events due to snow or bad weather, so that's worth keeping in mind too.

Komorin

While researching this, I found myself re-reading the part about the stone with what's said to be Sumerian characters engraved on it more than once. I have no idea whether it was really an ancient sundial, but just standing on the hill and watching the sun at the summer or winter solstice sounds like it would be a pretty special experience.

What I Found Out About Facilities and Access

As far as I could tell from the official website, only restrooms were listed among the facilities, and I couldn't find any detailed mention of a cooking area, water source, or power outlets. It seems to be positioned less as a typical campground and more as a place for enjoying the hill itself, so it seems like a good idea to bring your own gear fully prepared.

As for reservations, I couldn't find any mention of an online form on the official website, so it seems reservations need to be confirmed by phone with the Minamioguni Town Tourism Association, the listed contact. I won't include the number here, but it seems both reservations and inquiries can be made by phone. I also wasn't able to confirm whether parking is available or how many spaces there are, within the scope of what I looked into this time.

For access without a car, I came across examples of combining a bus and taxi from JR Hita Station or JR Aso Station, and from the Fukuoka direction, combining a direct bus to Kurokawa Onsen with a taxi. I didn't find any information suggesting you could get there on foot alone, so as someone who barely drives, it seems more realistic to plan around a combination of public transportation and taxis. Since Kurokawa Onsen is also located within Minamioguni, some people might plan to stop by there as well.

Rakuten Mobile Signal Conditions

When I checked the location of this facility using the official "My Area Connectivity Simulation" tool, no result was displayed, and instead I got a message saying something like "Currently under temporary maintenance." It seems this kind of message can appear when address data isn't available for the location in question.

Because of this, I'm not able to report on Rakuten Mobile's signal in terms of "good" or "unstable" this time, and the only honest conclusion is that the situation is unknown. Without exaggerating, it seems best to just share that as it is. Given that it's located on a hillside, it also seems like the kind of place where signal reception could vary a lot depending on the exact spot, so if you're actually planning to go, it might be reassuring to check for yourself beforehand.

Komorin

Honestly, I felt a little deflated when no result came up. Being on top of a hill, it's exactly the kind of spot I'd be curious about, but since I can't say anything definite, I think the most reliable thing for anyone planning to go is to check for themselves.

Wrapping Up

To sum it all up, Oshitoishi no Oka Campground gave me the impression of being an unusual type of campground where you can enjoy a cluster of huge stones spread across a hill at an elevation of 845 meters along with a 360-degree view. The facilities seem minimal, so it seems necessary to bring your gear well prepared, and since opening hours and reservation methods vary by source, it seems reassuring to inquire in advance.

As for Rakuten Mobile's signal conditions, no result came up this time, so the outcome was that the situation remains unknown. If this concerns you, it seems like a good idea to check with the official tool yourself before heading out.

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Related Links

• Official Site