Oshitoishi no Oka, a Hidden Power Spot in Kumamoto Where Mysterious Giant Stones Are Full of Magnetism

[Important] About the 2026 Kumamoto Earthquake

Because of the Kumamoto Earthquake of 28 July 2026, some tourist facilities and roads in Kumamoto Prefecture may be closed or impassable. Kumamoto Castle reopened on 13 August 2026, but the Kumamoto Castle Museum "Wakuwaku-za" remains temporarily closed (as of 13 August 2026). Please check the official information for each facility before you set out.

Always confirm the latest information on each facility's official website and in announcements from the local authorities before you travel.

On a hill about 845 meters above sea level in Minamioguni Town, Aso District, Kumamoto Prefecture, Oshitoishi no Oka is scattered with several hundred boulders of varying size. The largest, called Oshitoishi, is a pyramid-shaped megalith around 5.5 meters tall with a circumference of about 15 meters, overwhelming those who see it. These stones are said to be a lined-stone arrangement placed by human hands, and the site has drawn attention as a mystery-filled power spot evoking prehistoric megalithic culture.

Highlights

• A grand landscape formed by the several hundred stones scattered across the hill, led by the 5.5-meter Oshitoishi megalith.
• A curious magnetic phenomenon in which a compass is said to spin near the stones. You can test it around the back of the so-called Sun Stone.
• A vast panorama unique to the hilltop, taking in the great grasslands of Aso and distant mountain ranges.
• A mystical, open atmosphere that evokes the romance of antiquity.

Enjoying the Seasons

From spring into summer, the boulders stand out against the lush grassland for a refreshing view. In autumn, silver grass sways golden and the stones glow dreamlike in the setting sun. In winter, the crisp scenery visible far into the distance is a draw in the clear air. Since nothing on the hill blocks the wind, choosing a fine day lets you enjoy the views to the full.

Access and Basic Information

• Location: 511 Nakabaru, Minamioguni Town, Aso District, Kumamoto Prefecture
• By car: About 25 minutes from Kurokawa Onsen. Also accessible from the Aso side
• Admission: The fee is around 200 yen for adults (this may change, so check in advance). Hours are roughly 8:30 to 17:00, and you can also enter during times when no staff are present
• From the parking area, walk gently up to the hilltop

Practical Travel Notes

• Little on the hilltop blocks sun or wind, so a hat, sun protection, and a jacket make the visit more comfortable
• Since you walk on grassland, shoes that are easy to walk in are recommended
• Combining the visit with Kurokawa Onsen makes it easy to plan a day-trip stroll route
• Entry procedures and hours can change by season, so confirming in advance with the Minamioguni Town tourism association is reassuring

A Word of Advice

The wind on the hill is strong, so take care that your hat is not blown away. Bring a compass and try the wonder of the needle moving beside the megaliths.

📚 Sources

This article was edited as general sightseeing information based on the public information on entry and opening hours issued by Minami Oguni Town and the local tourism association that manage Oshitoishi no Oka, the on-site guidance on the megaliths and the magnetic phenomenon, and public information on the nearby Kurokawa Onsen. The entry method and opening hours may change by season. Before you set out, please confirm the latest details through official sources such as the Minami Oguni Town tourism association.

Visitor Checklist

• Estimated time: About 30 minutes to 1 hour for a walk taking in the megaliths and the grand panorama
• What to bring: The hilltop has little to block the sun or wind, so bring a hat, sun protection, and a jacket; wear comfortable shoes for the grass, and bring a compass to try the magnetic phenomenon
• Check entry: Admission is about 200 yen for adults with opening hours around 8:30 to 17:00; the entry method and hours change by season, so check in advance
• Suggested route: Walk gently up to the hilltop from the parking lot, view the hundreds of stones including the roughly 5.5-meter Oshitoishi, and try the compass-spinning phenomenon behind the Sun Stone
• Combine your visit: It is about 25 minutes by car from Kurokawa Onsen, so a day-trip stroll paired with the hot spring is easy to plan