Official

Since 1590 when Ieyasu Tokugawa entered Edo Castle, magnificent infrastructure development has been promoted in various places. Among them, the largest and changed society is Tonegawa Togen.

The Tone River is currently pouring into the Pacific Ocean in Choshi City, Chiba Prefecture, but once pouring into Tokyo Bay today. The river was "replaced" for the purpose of protecting Edo from the flood of the Tone River, developing Nitta, and developing a boat route connecting Kanto and Tohoku. The beginning of the project is the deadline for the "Kai no Kawa" in 1594, 425 years ago. At this time, the Tone River was divided into two near Kamikawamata, now Hanyu City, Saitama Prefecture, with the association river to the south and the Asama River to the east. I closed the southern side of them. How hard did you have in the days when technology and information were not enough? In 1654, 60 years after this year, the Tone River finally became a river with the mouth of Choshi City. If Tonegawa Togen didn't take place, what kind of city would Chuo Ward and Tokyo have been? ？
Naturally, the Sumida River, Arakawa, Nakagawa River, and Ayase River will not be the same shape and scale as it is now, so a completely different city should have been formed. (Would you like somebody to draw?)

The monument commemorating the closing of Kawamata's closing ceremony is located along the Tone River dike in roadside rest area Hanyu. How about driving on a holiday?

The Civil Engineers Association of Japan (Public Corporation) has simplified the creation of a city in Edo, including Tonegawa Togen.