ArrowArtboardCreated with Sketch.Title ChevronTitle ChevronIcon FacebookIcon LinkedinIcon Mail ContactPath LayerIcon MailPositive ArrowIcon PrintIcon Twitter
Travel & Leisure

Japan underground: Explore a vast 'temple,' lake or gold mine

The country's subterranean world is rich in history and mystery

Tourists can ride a tram in the historic Ashio Copper Mine in Nikko, north of Tokyo.

TOKYO -- People have excavated beneath the earth from time immemorial: mining for riches, tunneling for transport, and creating spaces for safety and storage.

In a modern example, Boston's "Big Dig" in the U.S. has moved elevated highways in the downtown area underground, creating parks and bring people back into the city center. Shanghai has expanded its subway network to tackle air pollution.

In Japan, a legal change that allows public use of spaces deep underground that are not used by the owner of the land on top could help revitalize the country's cities.

Here are 10 underground spaces in Japan that are open for hands-on exploration. They were selected for their architectural or civil engineering importance, their historical or social significance, or their touristic or educational value.

Metropolitan Area Outer Underground Discharge Channel (Kasukabe, Saitama Prefecture)

This huge discharge channel, built as a flood-control measure for Greater Tokyo, runs 50 meters below ground for about 6 km. When runoff from heavy rains threatens to inundate small rivers, the structure diverts the excess water to the Edogawa River to minimize the damage. Water passes through subterranean tunnels, collected in a huge tank, and discharged. The tank, which is held up by 59 18 meter-high pillars weighing 500 tons each, has been dubbed an underground temple. When the Tokyo area was hit by Typhoon Hagibis in October, the discharge channel is reported to have substantially lessened the flood damage.

Oya underground quarry site (Utsunomiya, Tochigi Prefecture)

(Photo by Hideyuki Miura)

The Oya quarry covers 20,000 sq. meters and is 30 meters underground. The now-disused site was created by 70 years of excavation. Tours include a cruise on the subterranean lake that was created by rainwater seeping into the quarry.

Seikan Tunnel (Imabetsu, Aomori Prefecture and Shiriuchi, Hokkaido)

(Photo by Hideyuki Miura)

The Seikan Tunnel links two of Japan's four major islands, Honshu and Hokkaido, by rail. The world's longest undersea tunnel marked its 30th year in service in 2018. An exhibition hall in Aomori Prefecture offers visitors an eight-minute cable-car trip to underground passages used for the tunnel's construction 140 meters beneath the sea.

Super-Kamiokande (Hida, Gifu Prefecture)

(Photo by Takuya Imai)

This underground laboratory, one of the world's top facilities for the study of particle physics, is open to the public twice a year, in summer and autumn, although visitors cannot enter the neutrino detector tank, shown here.

Tokyo Bay Aqua Line (Kawasaki, Kanagawa Prefecture and Kisarazu, Chiba Prefecture)

This highway spans Tokyo Bay, stretching some 15 km, and is composed of a 10 km underground tunnel and a 5 km bridge. Tours start from the artificial island of Umihotaru and include the tunnel section.

Sado Gold Mine (Sado, Niigata Prefecture)

The Sado Gold Mine, which was run directly by the Tokugawa Shogunate in the Edo era (1603-1867), helped to keep the government financially afloat. The mine continued to operate in the modern era, finally halting production in 1989.

Kanden Tunnel (Tateyama, Toyama Prefecture and Omachi, Nagano Prefecture)

Construction of this tunnel was the biggest challenge in building the Kurobe Dam and the Kurobe River No. 4 Hydropower Plant.

Iwami Ginzan Silver Mine (Oda, Shimane Prefecture)

In the Iwami Ginzan Silver Mine, which was named a UNESCO World Heritage Site in 2007, has more than 600 tunnels or mabu. Ryugenji mabu, is the only one that is permanently open to the public.

Ikeshima coal mining island (Nagasaki)

The coal mine on the island of Ikeshima, in the city of Nagasaki, closed in 2001, making it the last coal mining island in the Kyushu area. Tourists are free to explore the island.

Ashio Copper Mine (Nikko, Tochigi Prefecture)

During its golden era, Ashio, from which the Ashio Copper Mine takes its name, was known as Japan's largest mining town and supported the country's economic development. But the now-inactive site has a checkered history: Copper mining poisoned areas around the Watarase River and caused deforestation.

Sponsored Content

About Sponsored Content This content was commissioned by Nikkei's Global Business Bureau.

You have {{numberArticlesLeft}} free article{{numberArticlesLeft-plural}} left this monthThis is your last free article this month

Stay ahead with our exclusives on Asia;
the most dynamic market in the world.

Stay ahead with our exclusives on Asia

Get trusted insights from experts within Asia itself.

Get trusted insights from experts
within Asia itself.

Try 1 month for $0.99

You have {{numberArticlesLeft}} free article{{numberArticlesLeft-plural}} left this month

This is your last free article this month

Stay ahead with our exclusives on Asia; the most
dynamic market in the world

Get trusted insights from experts
within Asia itself.

Try 3 months for $9

Offer ends July 31st

Your trial period has expired

You need a subscription to...

  • Read all stories with unlimited access
  • Use our mobile and tablet apps
See all offers and subscribe

Your full access to Nikkei Asia has expired

You need a subscription to:

  • Read all stories with unlimited access
  • Use our mobile and tablet apps
See all offers
NAR on print phone, device, and tablet media

Nikkei Asian Review, now known as Nikkei Asia, will be the voice of the Asian Century.

Celebrate our next chapter
Free access for everyone - Sep. 30

Find out more