Official

It is said that Zuiken Kawamura (1618-1699) developed the eastbound route and the westbound route, and excavated the Shinkawa in Chuo-ku, and had a mansion all over Rei Kishijima (currently Shinkawa 1-chome). From "Chuo-ku Shiri Encyclopedia" that can be seen on foot). It can be said that he was a great man who made a great contribution to logistics throughout the country at that time.
Zuiken Kawamura thought that "Kujo Island" at the mouth of the Yodo River in Osaka was one of the causes of the flood, and excavated a waterway that runs straight through the middle of Kujo Island. This is the current "Aji River". Kujo Island is divided into two, and the left bank (southeast side) of the Aji River is called "Kujo", and the right bank (northwest side) is called "Nishikujo", and its place name still remains.

The other day, there was a live performance in Nishikujo, so I went to see the Aji River and found interesting things locally. The Aji River Tunnel, which opened in 1944, is a tunnel that used to be lurking underground by an elevator. Now, the traffic part of cars has been abolished, but many pedestrians and bicycles are coming and going by elevators and tunnels. There is no bridge in this area where pedestrians and bicycles can cross, so it is still being used as a valuable infrastructure.
For those who want to know more about Zuiken Kawamura, we recommend Jun Ito, "The Man Who Created Edo" (Mainichi Shimbun Publisher, September 2016).