The firefly of the City River
“Luciferin luciferase reaction”

Attractions and Features

The Tsu-u-tsu Gawa River flows to Nakazato near the city boundary between Nagasaki City East and Isahaya city.In the summer, this is the most famous firefly spot in Nagasaki city.

This is the peak of the year from the middle of May to the beginning of June around 8:00 to 9:00 pm.

The recommended spot is near the bridge of the top picture.I think that I can find it from the vicinity of the bridge of the expressway toward the upstream.It is also possible to get down downstream, but you can enjoy it even from the bridge.Be careful with your feet.

Points of the Firefly ornamental

1. Check the appearance of fireflies

It is not necessarily to be seen if it goes, and the place where the firefly is difficult to admire.There is a very wonderful page which summarizes the appearance situation of the Firefly in the HOMEPAGE of Nagasaki City (here).I recommend that you check in advance.

2. Keep the precautions

Firefly is a wild creature that has a strong environmental directivity (can’t live when it is destroyed by humans).Please observe by observing manners.

Please use the nearest public transport as much as possible when you go to see the Firefly.In addition, when viewing fireflies, please do not disturb the traffic of public transportation and surrounding vehicles.
・Firefly is an insect that hates artificial light, so please refrain from car headlights, flashlights, camera flashes, etc.
・When you watch a firefly, please watch it quietly so that it does not become a nuisance of the resident. Also, please do not enter the private land without permission.
Please take home your garbage at the viewing place.
・Firefly is a short life of only one week.Please watch softly without bring.

On the manners at the time of the HP Firefly in Nagasaki City

Traffic access

Please take a taxi after getting off at JR Hizen Koga Station.


If you are visiting by car, please follow the local traffic arrangement.* There was a local parking lot in 2016.Please be careful NOT to turn your car headlights on the river when parking.

Useful Links

Nagasaki City official WEBSITE of Nagasaki Firefly information WEBSITE.It is a wonderful site which has the spot of the number of fireflies appearance in various places in Nagasaki city.

Google Maps

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