It is surrounded by various districts in Sumida, Chūō, and Taitō wards: Yokoami, Midori, Chitose, Higashi Nihonbashi, and Yanagibashi.
The Forty-seven rōnin avenged the death of their lord, Asano Naganori, by breaking into the mansion of his enemy, Kira Yoshinaka, in 1703.
Because the Ryōgoku bridge was developed in the region, during the Edo period this part of Tokyo became as significant as Ueno and Asakusa.
Sumida City Board of Education (墨田区教育委員会) operates public elementary and junior high schools.
[3] Famous people connected with Ryōgoku include Katsu Kaishū, statesman and naval engineer, who was born there in 1823.