[Visiting special places that are not usually open to the public.≪Electronic Coupon≫ “Nase Dam” Premium Guided Tour

Through a mysterious door in the embankment.
Go to the dam's underground passageway audit corridor GO!

Mysterious door downstream of the dam...
On the guided tour, this doorway is called the audit corridor.
Visitors will enter the dam's underground passageway and tour the interior of the dam.
Descend 149 steps from EL140m to EL108m deep underground to the bottom of the dam.
There, you can see the cornerstone that watches over the safety of the dam. The Ministry of Land, Infrastructure, Transport and Tourism (MLIT), which manages the dam, will provide explanations at various locations, so please feel free to ask any questions you may have.
On the way back, of course, you will have to climb 149 steps. Although it requires a bit of physical strength, we hope you will experience the bottom of the dam, which is usually inaccessible to visitors!

*For those who have difficulty going up and down the stairs, etc., please ask at the registration desk for free time at the downstream plaza.

One person 2000yen
Electronic coupon plans.
Please apply from your smart phone.
Tour timeApprox. 75 min.
Target AgeElementary school students and above
DurationFrom March 1, 2023

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Recommendations for this Plan

Three roles and purposes of the NANASE DAM

(1) "Flood Control": Protecting Areas along the Oita River from Flood Disasters

(2) "Preservation of the river environment": Maintain river water levels and protect riparian ecosystems by replenishing water stored in dams even when river water levels decrease due to continued sunshine.

(3) "Securing water supply" to ensure stable water supply in the event of drought conditions by supplying water stored in dams.

Size of NANASE Dam

(1) It is approximately 92 meters high, equivalent to a 30-story building in height!

The volume of water that can be stored in the dam is approximately 24 million m3. The volume is equivalent to about 13 cups of Resonac Dome Oita (an international-class multipurpose stadium with a capacity of 40,000 people) in Oita City!

(iii) "Rock-fill dam" style
Dam made by piling up natural materials such as rocks and earth

Roadside Station "Notsuharu

It sells fresh and processed agricultural products from the area and has a café-restaurant with a menu featuring ingredients from Oita Prefecture.

The facility is made in the image of an old farmhouse with a straw roof and a wooden one-story house.
The dam lake side is entirely made of glass, and there is an outside observation deck where visitors can take a break while enjoying the view of "Lake Notsuharu" and eat in gourmet food purchased at the roadside station.

Plan Details

Road Map

Meeting place: Nase Dam Management Office Building
     Address: 1546-4 Shimobara, Oita City, Oita Prefecture


Reception start
Location: Nase Dam Management Office Building
   1st Floor Exhibition Room


Explanation of dam outline
Location: Monument Plaza


Move to the plaza downstream of the dam complex
Transportation should be on foot or by your own vehicle.
Staff will lead the way.


Visit to the inside of the dam (audit corridor)
Helmets must be worn to visit the audit corridor.
(Helmets will be provided by the dam.)


free time
Location: Downstream plaza of the dam's main body


End of tour


Move to "Notsuharu" Roadside Station
*Please walk or use your own car for transportation.

Please ask the cashier staff. You will receive original goods. Also, please cooperate with us by filling out the questionnaire.

Then disbanded
After the tour, you can also take a ride on the Green Slow Mobility, which operates every Wednesday to circle around the dam. (Free ride, departs from Roadside Station at 11:30 a.m.)

About Icons

Plan Information

設定日 2023年3月1日(水)~
ご旅行・プラン代金に含まれるもの ①国土交通省ダム職員による



最少催行人員 2名
最少受付人員 2名
最大受付人員 10名

予約締切 5日前の17時
服装 滑りにくい靴でご参加ください。
集合場所 ななせダム管理庁舎

Important point

  • In case of natural disasters such as typhoons or heavy rain, or in case of emergency, the tour may be cancelled at short notice. Please understand this in advance before applying for the tour. (If we know in advance, we will notify you at least one day before the tour, but it may be unavoidable on the day of the tour.)
    Please note that you will need to drive your own car to the plaza downstream from the dam.
    Helmets must be worn to visit the audit corridor. (Helmets will be provided at the dam.)
    Please note that you cannot choose the type of dam card.
    The contents of the original goods are subject to change.
    ●We do not take into consideration barrier-free accessibility, etc., so please understand this before applying.
    Please understand that you will be walking long distances, including long flights of stairs. Please understand this before applying.
    Please wear non-slip shoes.
    The time of the itinerary is only a guide. The time, contents, and places to be visited may be subject to change depending on conditions on the day of the tour. Please understand this in advance.
    ● As a measure against corona infection, we ask you to measure the temperature on the day of departure. Those with a body temperature of 37.5 degrees or higher cannot participate in the tour, so please take care of your health in advance.
  • Disclaimer and precautions concerning tours of the Nase Dam facilities, etc.
  • Local correspondence will be in Japanese.


  • After completing the application online, we will send you an "Reception Completion Information" email (automatically sent). Please be sure to check the contents of the email.
    ≪If you do not receive the email, please check here. ≫
  • You can use the electronic coupon from your smart phone at the reception desk at Michi no Eki Tsuruharu.
  • ◆My Page
    You can review your application, select a payment method, and cancel.
    The ID for login is your registered email address.
    *If you are unsure of your password, click the "Confirm Password" button and it will be sent to you by e-mail.

Cancellation Fee

If you cancel the contract at your convenience after the contract is concluded, you will be charged a cancellation fee for the travel fee at the following rate per customer. In addition, if some customers cancel the contract due to the participation of multiple people, the difference price for the change in the number of users (per vehicle / room) from the participating customers to the transportation / accommodation facility, etc. Will be charged respectively.
In case of cancellation or change, please contact us during business hours. (If the business hours have passed, it will be treated the next day.)

Starting from the day before the travel start date
3 days ago to the day before
Before the start time of the day After the start time / No contact non-participation
20% 50% 100%

In case of cancellation or refund due to reduction of personnel, the refund will be made after deducting the prescribed cancellation fee rate, but the transfer fee for refund will be borne by the customer. Similarly, if you purchase a ticket or other product and get a refund, you will not be charged a cancellation fee if there is no cancellation fee, but you will be responsible for the transfer fee for the refund.

Planning and Implementation Company

Mie Kotsu Co., Ltd. Sightseeing Sales Systems Landing Tour
TEL 050-3775-4727
MAIL visityoyaku@kanko-pro.co.jp
2nd floor, Kusumoto 15th Building, 1-7-2 Nishiki, Naka-ku, Nagoya 460-0003
Travel agency registration: Japan Tourism Agency registered travel agency No. 1934
General travel business handling manager: Tatsuya Ogawa

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