Okawa (Sumida River) - Okawa

…In the past, it was also written as Sumida River, Tsunoda River, and Sumida River, and was also called Suda River, Asuda River, Someda River, Asakusa River, and Miyato River. In the early modern period, the downstream part from the current Azuma Bridge was familiarly known as Okawa River. In the upstream part, the Iruma River was the main river in the old days, but in the Kan'ei era (1624-44), the Arakawa River was diverted at Kuga, Kumagaya City, and the river course was transferred to the Iruma River, and the Sumida River became the mainstream of the downstream Arakawa River. …

*Some of the terminology that refers to "Okawa (Sumida River)" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…古くは住田川，角田川，墨田川とも書き，須田（すだ）川，あすだ川，染田川，浅草川，宮戸(都)川とも呼ばれた。近世，今の吾妻（あづま）橋から下流は大川の名で親しまれた。上流は古くは，入間（いるま）川を幹川としていたが，寛永年間(1624‐44)に現在の熊谷市久下で荒川の瀬替えが行われ，河道が入間川に移され，隅田川は荒川下流の本流となった。…

※「大川（隅田川）」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報