Among the many Edo pictorial maps, the oldest one with certain content is the Kanei era Edo map.
Two islands are lined up in the lower center of the figure, slightly to the right, between which "Niihori" is written.
Niihori is the estuary of the current Nihonbashi River, Reigishima on the left and Hakozaki on the right. It is written as "town".
The figure refers to the one listed in [Chuo-ku History Chart, Nihonbashi Hen, '' but it seems that it shows the appearance of Edo city around Kanei 9 (1632), and by this time, the island and town It is certain that it has already been done.
On the other hand, in the "Chuo-ku Chronology" section of Genwa 6 (1620), there is a description that means that Niihori was excavated and Machiya was established around this time, but this is based on the "Tokyo Prefectural Shiryo". There is no doubt that it reflects the fact that Kita Niiborimachi and Hakozakicho were already on this island at this time.
If it was founded during the Genna period, it would be natural that it was named as the so-called "Edo Furumachi 300 towns".
