Live camera
Honmyo River live camera — Isahaya, Nagasaki
A short river through central Isahaya. Because of the 1957 flood disaster, it is watched especially closely.
Sample August 2026Watch it here
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What you are looking at
Being short and running through a town is exactly the combination that made the damage large. Rain falling on the hills upstream has almost no time before it reaches the town. After the 1957 flood, the stone spectacle bridge that crossed the river was judged to obstruct the flow, taken out of the river, and moved to a nearby park. They moved a bridge to secure the width the water needed.
So the density of monitoring is high relative to the river's length. Normally it looks like a narrow river running quietly through a town.
The channel is 28 kilometres and the basin 249 square kilometres, unusually small for a first-class river in Kyushu. The source is Mount Gokahara in Isahaya at 1,057 metres, and the river runs south down the steep foot of the Tara range to the Ariake Sea. Most of the 88,500 people in the basin are gathered in the town of Isahaya, on the middle course.
What stands out about this river is the sheer number of floods. The Isahaya Nisshinki records floods from the middle of the 1600s onward, and on the written record alone some sixty floods have done damage here in about three hundred years. A short river with steep mountains joined straight onto reclaimed flats, and a town sitting on the seam between them: the setting is what the count is made of.
The end of the rainy season in June and July, and typhoons, move it most. The rougher the day, the darker the picture. Leave evacuation decisions to the local authorities.
About this camera
| Place | Isahaya, Nagasaki |
| Format | Live video, rotating |
| Time zone | Asia/Tokyo (UTC+9) |
| Category | River |
| Operator | MLIT river live streams |
| Terms of use | Government Standard Terms 2.0 |
The operator's own page
The footage belongs to each agency. This site is an unofficial guide, and each sample frame was copied once per camera under that agency's terms of use.