"Sanjikenbori" is described on page 47 of "Monoshiri Encyclopedia".
At present, the following explanatory version is installed as "Sanjumabori Ruins" (some Chinese numerals are converted to arithmetic numerals).
"The ruins of Sanjuma moat
Location 1-8, Ginza, Chuo-ku Region
Sanjumabori is an entrance between the current Chuo-dori and Showa-dori, from the Kyobashi River to the Shiodome River. In 1612 (1612), in order to maintain Funairi moat in Edo, it was completed by ordering the Saikoku Daimyo to open the excavation work. The name is derived from the fact that the moat width was thirty. In the Edo period, the west bank was 1-8-chome, the east bank was 1-7-chome, and the coast was 1-7-chome, and there was a riverbank as a landing site for boat transport. At the beginning of the Edo period, "Edoshozu in Bushu Toyoshima-gun (Edo in the Kanei era), the Owari Tokugawa family and the Kii Tokugawa family are lined up on the east side of the moat, and daimyo residences such as Kyogoku, Kato and Matsudaira are lined up. It is depicted. In 1828 (1828), the banks of both banks were widened, and the width of the moat was narrowed to 19, but since then boats have been actively coming and going and used to transport many luggage. From the map of 1884 (1884), it can be seen that there were many bridges in the north, such as Shinpukuji Temple Bridge, Toyozo Bridge, Kii Kuni Bridge, Toyotama Bridge, Asahi Bridge, Mihara Bridge, Kibiki Bridge, Izumo Bridge, etc. . Sanjumabori was reclaimed in 1948 (1948) to process ashes after the war, and disappeared after completion in July 201515. March 2008 Chuo-ku Board of Education
Kafu depicts the scenery of the digging seen from Izumo Bridge as follows in a part of Shimbashi Night Story, "Unexpected Dream" (1910).
"I came to the front of Izumo Bridge, thinking that I would turn Yokomachi, which I walked with Masaji, toward Kiboricho. The deep view of the ditch seemed more and more calm, and on the sinking water surface, along with the shadows of the roofs of the houses on both sides of the slept, he seemed to be seen in his appearance if he looked young, so he stood on the bridge and put himself on the balustrade." (5-250)
