Accommodation & Plan Search

All Accommodations
  • Check-in

  • Check-out

Accommodation & Plan Search

All Accommodations
  • Check-in

  • Check-out

Information

Discover Genji-Botaru Fireflies at Altitude

Shiga Kogen’s Rare Genji-botaru Fireflies

Genji-botaru is a large species of firefly. Its rare life cycle, where the larvae develop underwater, makes it exceptional among fireflies worldwide. In Shiga Kogen, this species lives at Japan’s highest-altitude habitat. The long lifespan and extended light flickering cycle of the adult firefly have earned it the designation of a National Natural Treasure.

 

 

Ishinoyu Genji Fireflies: The Best in Japan

  1.   The habitat’s altitude is the highest in Japan at 1,650 meters.
  2.   The adult firefly’s active period is the longest in Japan, from late May to early September.
  3.   The larvae’s time on land is the longest in Japan.
  4.   The adult firefly has a long lifespan.
  5.   The adult firefly’s light flickering cycle is long.

 
Best Season: July to mid-August
Best Hours: About 19:30 – 20:30

 

Firefly Watching

Ishinoyu area is generally open to the public for free every year for firefly watching.
Fireflies are very delicate creatures and their habitat is just as important as that of other plants and animals. However, extra care is needed when observing them. We kindly ask that you follow the rules below during your visit to help protect the fireflies and their habitat.

One of the most basic manners of nature observation is do not disturb other living creatures.

Visitors may just want to see the light of fireflies, but where fireflies live, other creatures also inhabit. The coexistence of these various creatures protects this natural and precious place. If you disturb other creatures to see fireflies, you will change the environment of the area and make it a difficult place for fireflies to live. Please appreciate the light of fireflies quietly.
 
*To protect fireflies, other animals and plants, please do not bring pets into the Firefly Park.

Please stay away from the river and its banks.

Fireflies live in the river and around the riverbanks during their growth process. If you get too close to the river and step on grasses or stones, you may step on firefly eggs or larvae, or drop them into the river.

Throwing stones into the river is a serious nuisance not only to fireflies, but also to any other creatures living in or near the river.

We would like you to know that a simple mischievous act can cause serious damage to the plants and animals that live here.

Please don’t interrupt firefly conversations. They do not like artificial light.

Fireflies communicate with their lights, it is the language they are using. In the dark, the female and male use light to talk to each other. For example, the glow of a “flash light” is the male calling out to the female, “I love you”.
 
Therefore, they strongly dislike artificial light (smart phone display light, car lights, flashlights, torches etc.) that prevents them from talking to each other. When visiting fireflies, please DO NOT use any equipment or other devices that may affect firefly ecology.

Follow the Guidance of Staff

During the event period, members of the Shiga Kogen Genji-botaru Firefly Park Management Committee will guide visitors from the parking area to the viewing site.
As this is a nighttime viewing event, entering areas not indicated by staff is very dangerous and strictly discouraged.
To protect the fireflies, other wildlife, and to ensure an enjoyable experience for all visitors, please avoid loud conversations and refrain from using any lights during your visit.

For photographers

During the viewing event, the area can get very crowded with general visitors. Therefore, we have set aside specific times and dates for photographers to visit exclusively for photography. To ensure everyone can capture the perfect shot, please be considerate of fellow photographers and avoid disrupting their work.
 

  • Period: From early August to the end of August
  • Hours: After 20:30 daily
  • Set up equipment (such as tripods) in areas that will not obstruct the passage of other visitors.
  • Entry is prohibited in areas where the vegetation has not been cleared.
  • Photography is prohibited on the bridge and within 1 meter before and after the bridge.
  • Photography using light-emitting equipment (such as flash or display light) is prohibited.
  • The use of drones and selfie sticks is prohibited.
  • Photography outside of the designated period is prohibited.
  • Do not approach the river or its banks.

 

Ishinoyu Genji-botaru Park


 

Parking


 

⚠️ Important Notes ⚠️

  • This event is only open to those staying within Shiga Kogen or those who can arrange their own transportation.
  • No public transport will be provided from Nagano Station, Yudanaka Station, the Shibu Onsen area, or any other locations within Shiga Kogen.
  • If you require transport, kindly ask your accommodation to assist with arrangements.
  • Temporary public toilets will be available, but please be aware that their number is limited.

 

▼ Don’t forget to use the SHIGAKOGEN NAVIGATOR! ▼

Inquiries via Telephone

TEL.
0269-34-2404
FAX.
0269-34-2344

Please call between 8:30~17:00/ Available all year round (Subject to temporary closures)

Inquiries via Email

top