Maps: Koto-ku rivers and canals 江東内部河川地図

Map 1: Koto-ku Shitamachi rivers and canals 下町河川の概要 (source)

There are eleven rivers that together form the Koto Interior River 江東内部河川 (source); they are:

1. 旧中川 Old Nakagawa River (Kyu-Nakagawa)
2. 大横川 Ooyokogawa
3. 大島川西支川 Ooshimagawa Nishi-Shisengawa
4. 大横川南支川
5. 北十間川 Kitajikkengawa
6. 横十間川 Yokojikkengawa (I believe)
7. 仙台堀川 Sendaiborigawa
8. 平久川 Heikyugawa (I believe)
9. 小名木川 Onagigawa (appears as ‘Konaki River’ per Google Maps)
10. 竪川 Tatekawa
11. 越中島川 Etchūjimagawa

Map 2: from 図説　江戸・東京の川と水辺の事典 Dictionary Encyclopedia of Rivers and Watersides in Edo / Tokyo

Koto-ku is represented in the quadrant in the lower-left of the map.

Map 3: from The Lumber Industry in Early Modern Japan

Tokyo, circa 1880″

Map 4: Detail of the Etchujimagawa River 越中島川 (#11 in the list of interior rivers) (source)

Map 5: One more version of the Koto Interior River map 江東内部河川位置図 (source)

Map 6: Historical photos of Koto-ku (source)

See also:

• Koto-ku walking map: Clover Bridge, Onagigawa River, & Higashi-Ojima
• Elevation and flood maps of Tokyo
• Koto-ku tourism: Lucky Dragon boat and atomic tourism
• Canals of the Ginza: floating through time on Tokyo’s central waterways
• Lumberyards on the Takekawa in Honjo (Hokusai woodblock print)
• Nakagawa Funabansho Barge Museum 中川船番所資料館 /江東区中川船番所資料館
• Kiba lumber ponds of Koto-ku, 1946 map