I cycled along the Nakagawa again today, even though the weather looked threatening. Here is a picture of my route.
It looks like past the first bridge, around the bend, there is a 2nd bridge. So weather permitting I’ll go to the next one tomorrow. Then there are more bridges and a confluence of rivers further on.
I was disappointed to find out that the round trip was just about 3 km. But I’m just starting. I’ll get it up to a more substantial distance as soon as I can!