Home/Kumamoto/Minamioguni/Oshitoishi Hill

Oshitoishi Hill

OshitoishimegalithsMinamioguniAso rimgrassland

Kumamoto · Minamioguni

33.0715°N, 131.0373°E

On a grassland hill at 845 metres on the outer rim of Aso stand several hundred stones, some of them very large, arranged in nine groups that do not look accidental. The biggest is a pyramid-shaped block 5.5 metres high and 15.3 around. One stone carries markings that a 1990s survey identified as petroglyphs and attributed to Sumerian-influenced seafarers, which is a claim well outside the archaeological mainstream and should be treated as such.

What is not disputed is that the stones are there, that some are aligned, that one pair works as a sundial, and that the view from the hill across the Aso caldera and the Kuju range is spectacular. It is privately managed, costs ¥200, and the grassland walk to the stones takes a few minutes from a ten-space car park.

Essential Information

Opening Hours

Daylight hours — confirm arrangements before travelling

Closed: Confirm seasonal access before travelling

Entrance Fee

¥200 adults | ¥100 elementary and junior high school students | Free parking

Best Season

Late April–October | Clear days for the caldera view

Visit Duration

45–60 minutes

Getting There

Access Information

Nakabaru 511, Minamioguni, Aso District, on grassland at about 845 m on the outer rim of Aso. By car from JR Aso Station. Admission ¥200 for adults and ¥100 for elementary and junior high school students. Free parking for about 10 vehicles. Several hundred stones stand in nine arranged groups, the largest 5.5 m high and 15.3 m around. Inquiries to the Minamioguni tourism association. Confirm opening arrangements and seasonal access before travelling.

Insider Guide

Premium

**Treat the Sumerian claim with caution.** The petroglyph identification comes from a private survey and is not accepted archaeology. The stones and the alignments are real; the interpretation is contested. **Ten parking spaces.** On a grassland hill with no facilities. It fills quickly on fine weekends. **The view is the other half.** Aso caldera on one side, the Kuju range on the other, from 845 metres of open grass. Clear days make the trip. **Find the sundial pair.** Two stones set so that the shadow marks the time. Whatever the age, the arrangement is deliberate. **It is private land.** ¥200, managed locally, with an honesty-based system at quiet times. Respect the grazing and the fences.

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