The postal code divisions in Adachi City felt far more complex than those in Edogawa or Katsushika, where I had walked before.
I usually rely on Google Maps to trace these boundaries, but in this area, they don’t follow simple lines like rivers or major roads, making them difficult to identify.
Moreover, postal code 121 covers a wide area, and the further north you go, the fewer stations you find.
It would be difficult to cover everything in a single walk, so I decided to divide the area into four parts.
For this first route, I started from Rokucho Station, headed east, and then followed the Nakagawa River back.

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