Akiyoshido Cave and Akiyoshidai Plateau

秋芳洞と秋吉台 · Yamaguchi Prefecture · Mine City

Photo: uesakakohei · CC BY 2.0

Mine City, Yamaguchi Prefecture, within Akiyoshidai Quasi-National Park; above ground is Japan's largest-class karst plateau (about 54 square kilometres), below it Akiyoshido Cave, over 11 kilometres in surveyed passages, with a show route of about 1 kilometre.

Know before you go

Red lines: do not touch stalactites or stalagmites in the cave, and do not leave paved paths. Taboos: no flash photography where forbidden in the cave, and no picking or fires on plateau grassland. Good manners: cave floors are wet and slippery, so wear non-slip shoes and walk quietly. Common mistakes for outsiders: (1) entering the cave in summer in only short sleeves — at 17°C it feels cool
(2) visiting after the spring controlled grass burn (山焼き) without checking official notices, when the grassland is blackened.

This article is Not yet verified. Please check official announcements for prices, opening hours and dates.

Stories & people

History

How Akiyoshidai and Akiyoshido formed

Akiyoshidai’s limestone originated in ancient marine reefs and was later uplifted into a plateau. Rainwater gradually dissolved the rock, creating surface karst formations and Akiyoshido Cave below. Annual controlled burning helps maintain the plateau’s grassland.

Source: Official tourism or heritage information

Culture

Culture & customs

Background

Akiyoshidai limestone began as a coral reef about 300 million years ago, later uplifted and dissolved by rain and groundwater into plateau and cave; the cave stays about 17°C year-round; Akiyoshido was designated a Special Natural Monument in 1952, Akiyoshidai a Quasi-National Park in 1955 and a Special Natural Monument in 1964; the Mine–Akiyoshidai area was listed as a UNESCO Global Geopark in 2026, as officially published for that year.

Local customs

(1) Tour Akiyoshido (秋芳洞) to see Hyakumai-zara terraces (百枚皿), the Gold Column (黄金柱) and other formations
(2) drive the Karst Road (カルストロード) and viewpoints on Akiyoshidai (秋吉台)
(3) walk the Akiyoshidai grassland trails (秋吉台草原)
(4) see the cobalt-blue spring at Beppu Benten Pond (別府弁天池)
(5) combine the Kurotani entrance (黒谷口) with the lift link to the cave mouth.

Etiquette & taboos

Don’t DON'T

Red lines: do not touch stalactites or stalagmites in the cave, and do not leave paved paths. Taboos: no flash photography where forbidden in the cave, and no picking or fires on plateau grassland. Good manners: cave floors are wet and slippery, so wear non-slip shoes and walk quietly. Common mistakes for outsiders: (1) entering the cave in summer in only short sleeves — at 17°C it feels cool
(2) visiting after the spring controlled grass burn (山焼き) without checking official notices, when the grassland is blackened.

Locals appreciate DO

Please respect local residents, open areas, and on-site rules.

Plan your visit

Practical info

Getting there	Intercity: about 40 minutes by bus from JR Shin-Yamaguchi Station to Akiyoshido; about 5 minutes by car from the Akiyoshidai interchange via the Minehigashi junction on the Chugoku Expressway. Local: on foot in the cave, by car or bus on the plateau. Tickets and payment: the plateau is free, cave admission is sold separately; buses take IC cards or cash. The fare scale is about a thousand yen, as officially published.

Getting there

Intercity: about 40 minutes by bus from JR Shin-Yamaguchi Station to Akiyoshido; about 5 minutes by car from the Akiyoshidai interchange via the Minehigashi junction on the Chugoku Expressway. Local: on foot in the cave, by car or bus on the plateau. Tickets and payment: the plateau is free, cave admission is sold separately; buses take IC cards or cash. The fare scale is about a thousand yen, as officially published.

Travel tips

The cave tour takes 1–1.5 hours
bring a light jacket. Cave humidity fogs camera lenses
on the plateau, wind is strong, so fasten hats.

Maps & transport notes

The pin is near the main entrance to Akiyoshido Cave
it does not mark the Akiyoshidai plateau.

Sources & verification notes

Official tourism or heritage information

Map location or safety reference

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