| 1．Iruma River |
| The Iruma River (入間川, Iruma-gawa), is a river in Saitama Prefecture, Japan.[1][2] It is 63 kilometres (39 mi) long and has a watershed of 721 square kilometres (278 sq mi). The river rises from Mount Ōmochi in Hannō, Saitama and flows to the Arakawa River at Kawagoe, Saitama. 35°54′35″N 139°32′43″E / 35.90982°N 139.545139°E / 35.90982; 139.545139 |
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| 2．Shingashi River |
| The Shingashi River (新河岸川, Shingashi-gawa) is a 34.6-kilometre (21.5 mi) long river that flows through Saitama and Tokyo, Japan.[1] It flows from the Musashino Plateau into the Sumida River at Iwabuchi in Kita, Tokyo.[2] |
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| 3．Metropolitan Area Outer Underground Discharge Channel |
| The Metropolitan Area Outer Underground Discharge Channel (Japanese: 首都圏外郭放水路, Hepburn: shutoken gaikaku hōsuiro), popularly known as G-Cans, is an underground water infrastructure project in Kasukabe, Saitama, Japan. It is the world's largest underground flood water diversion facility, built to mitigate overflowing of the city's major waterways and rivers during rain and typhoon seasons.[1] It is located between Showa and Kasukabe in Saitama prefecture, on the outskirts of the city of Tokyo in the Greater Tokyo Area. |
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| 4．Naka River (Saitama Tokyo) |
| 35°39′37″N 139°51′00″E / 35.660321°N 139.849917°E / 35.660321; 139.849917 The Naka River (中川, Naka-gawa) is a river that flows from Hanyu, Saitama to Edogawa, Tokyo, Japan, where it merges with the Arakawa River. It is 83.7 kilometres (52.0 mi) long. |
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| 5．Ayase River |
| The Ayase River (綾瀬川, Ayase-gawa) is a river in Japan. |
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| 6．Shiba River |
| The Shiba River (芝川, Shiba-kawa) is a tributary of the Arakawa River that mainly runs through the eastern part of Saitama Prefecture. The river has Suehiro (末広) and Kobari-ryōke (小針領家) in Okegawa, Saitama as points of origin and flows through Ageo, Minuma and Kawaguchi, and connects to the Arakawa River. |
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| 7．Arakawa River (Kantō) |
| The Arakawa River or Ara River (Japanese: 荒川, Hepburn: Arakawa, "kawa" (川) already means "river") is a 173-kilometre (107 mi) long river that flows through Saitama Prefecture and Tokyo.[1] Its average flow in 2002 was 30 m3/s. It originates on Mount Kobushi in Saitama Prefecture, and empties into Tokyo Bay.[2] It has a total catchment area of 2,940 km2 (1,140 sq mi). |
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