River

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

s of Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

are characterized by their relatively short lengths and considerably steep gradients due to the narrow and mountainous topography of the country. An often-cited quote is 'this is not a river, but a waterfall' by the Dutch engineer (o-yatoi gaikokujin

O-yatoi gaikokujin

The Foreign government advisors in Meiji Japan, known in Japanese as oyatoi gaikokujin , were those foreign advisors hired by the Japanese government for their specialized knowledge to assist in the modernization of Japan at the end of the Bakufu and during the Meiji era. The term is sometimes...

) Johannis de Rijke

Johannis de Rijke

Johannis de Rijke was a Dutch civil engineer and a foreign advisor to the Japanese government in Meiji period Japan.-Early life:...

 who had visited the Jōganji River

Jōganji River

The is a river in Toyama Prefecture, Japan, that flows through the city of Toyama and the town of Tateyama. The river had previously been called the Nii River .-Route:...

, Toyama Prefecture

Toyama Prefecture

is a prefecture of Japan located in the Hokuriku region on Honshū island. The capital is the city of Toyama.Toyama is the leading industrial prefecture on the Japan Sea coast, and has the industrial advantage of cheap electricity due to abundant water resources....

. The Mogami

Mogami River

The is a river in Yamagata Prefecture, Japan. It is 224 km long and has a watershed of 7,040 km². It is regarded as one of the three most rapid rivers of Japan ....

, the Fuji

Fuji River

The is a river in Yamanashi and Shizuoka Prefectures of central Japan. It is long and has a watershed of . With the Mogami River and the Kuma River, it is regarded as one of the three most rapid flows of Japan....

 and the Kuma are regarded as the three most rapid rivers of Japan.

Typical rivers of Japan rise from mountainous forests and cut out deep V-shaped valleys in their upper reaches, and form alluvial plain

Alluvial plain

An alluvial plain is a relatively flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms...

s in their lower reaches which enable the Japanese to cultivate rice

Rice

Rice is the seed of the monocot plants Oryza sativa or Oryza glaberrima . As a cereal grain, it is the most important staple food for a large part of the world's human population, especially in East Asia, Southeast Asia, South Asia, the Middle East, and the West Indies...

 fields and to set up cities. Most rivers are dam

Dam

A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...

med to supply both water and electricity.

The longest river of Japan is the Shinano

Shinano River

The Shinano River is the longest and largest river in Japan. It flows from Nagano Prefecture to Niigata Prefecture. It is called the Chikuma River in Nagano Prefecture....

, which flows from Nagano

Nagano Prefecture

is a prefecture of Japan located in the Chūbu region of the island of Honshū. The capital is the city of Nagano.- History :Nagano was formerly known as the province of Shinano...

 to Niigata

Niigata Prefecture

is a prefecture of Japan located on the island of Honshū on the coast of the Sea of Japan. The capital is the city of Niigata. The name "Niigata" literally means "new lagoon".- History :...

. The Tone

Tone River

The is a river in the Kantō region of Japan. It is in length and has a drainage area of...

 has the largest watershed and serves water to more than 30 million inhabitants of Tokyo

Tokyo

, ; officially , is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of Japan. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family...

 metropolitan area.

List of Rivers in Japan

The list below is in geographical order (from north to south). See also :Category:Rivers of Japan for an alphabetical list.

List of rivers in Hokkaidō by length

The following table is a list of rivers of Hokkaidō by length.

River	Length
	268 kilometres (166.5 mi)
	256 kilometres (159.1 mi)
	156 kilometres (96.9 mi)
	154 kilometres (95.7 mi)
	136 kilometres (84.5 mi)
	135 kilometres (83.9 mi)
	126 kilometres (78.3 mi)
	120 kilometres (74.6 mi)
	115 kilometres (71.5 mi)
	108 kilometres (67.1 mi)
	104 kilometres (64.6 mi)
	98 kilometres (60.9 mi)
	87 kilometres (54.1 mi)
	84 kilometres (52.2 mi)
	80 kilometres (49.7 mi)
	80 kilometres (49.7 mi)
	78 kilometres (48.5 mi)
	72.5 kilometres (45 mi)
	69.9 kilometres (43.4 mi)
	44 kilometres (27.3 mi)
	41.9 kilometres (26 mi)
	21 kilometres (13 mi)
	9.4 kilometres (5.8 mi)
Bifue
Okotanpe
Ninaru
Omakatu

List of class 1 rivers in Hokkaidō

The following is a list of the 15 first class rivers (1級河川) under management by the :

• Abashiri River
• Ishikari River
• Koetoi River
• Kushiro River
• Mu River
• Rumoi River
• Saru River
• Shibetsu River
• Shiribeshi-Toshibetsu River
• Shiribetsu River
• Shokotsu River
• Teshio River
• Tokachi River
• Tokoro River
• Yūbetsu River

Tōhoku

Tohoku region

The is a geographical area of Japan. The region occupies the northeastern portion of Honshu, the largest island of Japan. The region consists of six prefectures : Akita, Aomori, Fukushima, Iwate, Miyagi and Yamagata....

 

First class rivers under the control of Tohoku Regional Bureau (東北地方整備局

• Iwaki River (岩木川) - Aomori
• Takase River
  Takase River
  The is a canal in Kyoto, Japan. It rises from Nijō-Kiyamachi, going along Kiyamachi Street, and meets the Uji River at Fushimi port. The canal crosses with the Kamo River on the way. Today the south half is not connected with Kamo River.-History:...
  
   高瀬川 - Aomori
• Mabechi River (馬淵川) - Iwate, Aomori
• Kitakami River
  Kitakami River
  The is the fourth largest river in Japan and the largest in the Tōhoku region. It is 249 kilometers long and drains an area of 10,150 square kilometers. It flows through mostly rural areas of Iwate and Miyagi Prefectures. The river is unusual in that it has two mouths, one flowing south into...
  
   (北上川) - Iwate, Miyagi
• Naruse River (鳴瀬川) - Miyagi
• Natori River (名取川) - Miyagi
• Abukuma River
  Abukuma River
  The , with a length of 234 km, is the second longest river in the Tōhoku region of Japan and the 6th longest river in Japan. It runs through Fukushima Prefecture and Miyagi Prefecture, rising from springs in the peaks of the Nasu Mountains, collecting water from tributaries leaving the Ōu Mountains...
  
   (阿武隈川) - Miyagi, Fukushima
• Yoneshiro River (米代川) - Akita, Iwate
• Omono River
  Omono River
  The is located in Akita Prefecture, Japan. The river flows from Mount Daisen in the Azuma Mountains and drains into the Sea of Japan. The river's drainage basin is essentially the entire southern half of Akita Prefecture.-External links:...
  
   (雄物川) - Akita
• Koyoshi River (子吉川) - Akita
• Mogami River
  Mogami River
  The is a river in Yamagata Prefecture, Japan. It is 224 km long and has a watershed of 7,040 km². It is regarded as one of the three most rapid rivers of Japan ....
  
   (最上川) - Yamagata
• Aka River (赤川) - Yamagata

Second class river

• Oirase River
  Oirase River
  The is a river located in eastern Aomori prefecture, Japan.The Oirase River is the only river draining Lake Towada, a large caldera lake on the border of Aomori and Akita Prefectures. The river flows in a generally eastern direction, through the municipalities of Towada, Rokunohe, Oirase and...
  
   (奥入瀬川)

Hokuriku

Hokuriku region

The is located in the northwestern part of Honshū, the main island of Japan. It lies along the Sea of Japan within the Chūbu region. It is almost equivalent to Koshi Province and Hokurikudō area in pre-modern Japan....

 

First-class rivers under the control of Hokuriku Regional Bureau (北陸地方整備局)

• Ara River (荒川) - Yamagata, Niigata
• Agano River
  Agano River
  The Agano River is a river which flows from Fukushima Prefecture to Niigata Prefecture in Japan. It is called the Aga River or the Ōkawa River in Fukushima. It is 210km long with 7,710km² watershed....
  
   (阿賀野川) - Hukushima, Gunma, Niigata
• Shinano River
  Shinano River
  The Shinano River is the longest and largest river in Japan. It flows from Nagano Prefecture to Niigata Prefecture. It is called the Chikuma River in Nagano Prefecture....
  
   (信濃川) - Nagano, Gunma, Niigata
• Seki River (関川) - Nagano, Niigata
• Hime River (姫川) - Nagano, Niigata
• Kurobe River
  Kurobe River
  The is a river in Toyama Prefecture, Japan. 86 km in length, it has a watershed of 689 km².The river rises from Mount Washiba in the Hida Mountains and carves the deep valley known as the Kurobe gorge...
  
   (黒部川) - Toyama
• Jōganji River
  Jōganji River
  The is a river in Toyama Prefecture, Japan, that flows through the city of Toyama and the town of Tateyama. The river had previously been called the Nii River .-Route:...
  
   (常願寺川) - Toyama
• Jinzū River
  Jinzu River
  The is a river that flows from Gifu Prefecture to Toyama Prefecture in Japan. It is called Miya River in Gifu. It is in length and has a watershed of .-Geography:...
  
   (神通川) - Gifu, Toyama
• Shō River
  Sho River
  The has its source in Mount Eboshi in the Shōkawa-chō area of Takayama, Gifu Prefecture, Japan. After flowing for through the northern part of Gifu Prefecture and the western part of Toyama Prefecture, it empties into Toyama Bay....
  
   (庄川) - Gifu, Toyama
• Oyabe River
  Oyabe River
  The is a river in Toyama Prefecture, Japan.The river rises from Mount Daimon on the border of Ishikawa Prefecture and enters the sea at Toyama Bay.The name Oyabe is meaningless in Japanese...
  
   (小矢部川) - Ishikawa, Toyama
• Tedori River (手取川) - Ishikawa
• Kakehashi River
  Kakehashi River
  The has its source at Suzugaoka in the city of Komatsu, Ishikawa Prefecture, Japan.- Geography :The river flows from Suzugaoka, which is part of the same mountain chain as Mount Haku. It forms the southern border of Komatsu, separating it from Kaga....
  
   (梯川) - Ishikawa

Chūbu

Chubu region

The is the central region of Honshū, Japan's main island. Chūbu has a population estimate of 21,886,324 as of 2008.Chūbu, which means "central region", encompasses nine prefectures : Aichi, Fukui, Gifu, Ishikawa, Nagano, Niigata, Shizuoka, Toyama, Yamanashi, and often Mie.It is located directly...

 

Rivers that flow into the Sea of Japan

Sea of Japan

The Sea of Japan is a marginal sea of the western Pacific Ocean, between the Asian mainland, the Japanese archipelago and Sakhalin. It is bordered by Japan, North Korea, Russia and South Korea. Like the Mediterranean Sea, it has almost no tides due to its nearly complete enclosure from the Pacific...

:

• Agano-gawa
  Agano River
  The Agano River is a river which flows from Fukushima Prefecture to Niigata Prefecture in Japan. It is called the Aga River or the Ōkawa River in Fukushima. It is 210km long with 7,710km² watershed....
  
   (阿賀野川) - Niigata, Fukushima, Gunma
• Shinano-gawa
  Shinano River
  The Shinano River is the longest and largest river in Japan. It flows from Nagano Prefecture to Niigata Prefecture. It is called the Chikuma River in Nagano Prefecture....
  
   (信濃川) or Chikuma-gawa (千曲川) - longest of Japan
• Seki-kawa (関川) - Nagano, Niigata
• Hime-kawa (姫川) - Nagano, Niigata
• Kurobe-gawa
  Kurobe River
  The is a river in Toyama Prefecture, Japan. 86 km in length, it has a watershed of 689 km².The river rises from Mount Washiba in the Hida Mountains and carves the deep valley known as the Kurobe gorge...
  
   (黒部川) - Toyama
• Jōganji-gawa
  Jōganji River
  The is a river in Toyama Prefecture, Japan, that flows through the city of Toyama and the town of Tateyama. The river had previously been called the Nii River .-Route:...
  
   (常願寺川) - Toyama
• Jinzū-gawa
  Jinzu River
  The is a river that flows from Gifu Prefecture to Toyama Prefecture in Japan. It is called Miya River in Gifu. It is in length and has a watershed of .-Geography:...
  
   (神通川) - Gifu, Toyama
• Shō-gawa
  Sho River
  The has its source in Mount Eboshi in the Shōkawa-chō area of Takayama, Gifu Prefecture, Japan. After flowing for through the northern part of Gifu Prefecture and the western part of Toyama Prefecture, it empties into Toyama Bay....
  
   (庄川) - Gifu, Toyama
• Oyabe-gawa
  Oyabe River
  The is a river in Toyama Prefecture, Japan.The river rises from Mount Daimon on the border of Ishikawa Prefecture and enters the sea at Toyama Bay.The name Oyabe is meaningless in Japanese...
  
   (小矢部川) - Toyama, Ishikawa
• Tedori-gawa (手取川) - Ishikawa
• Kuzuryū-gawa
  Kuzuryu River
  The is a river flowing through Fukui Prefecture, Japan. It has its source at the Aburasaka Pass in the city of Ōno and empties into the Sea of Japan near the city of Sakai.-River system:...
  
   (九頭竜川) - Gifu, Fukui

Rivers that flow into the Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

:

• Fuji-kawa
  Fuji River
  The is a river in Yamanashi and Shizuoka Prefectures of central Japan. It is long and has a watershed of . With the Mogami River and the Kuma River, it is regarded as one of the three most rapid flows of Japan....
  
   (富士川) - Nagano, Yamanashi, Shizuoka
• Abe-kawa
  Abe River
  The is a river in Shizuoka Prefecture of central Japan. It is long and has a watershed of .The river rises from Akaishi Mountains which stretch over the border between Yamanashi and Shizuoka Prefectures, and flows into Suruga Bay in the Pacific Ocean)...
  
   (安倍川) - Shizuoka
• Ōi-gawa
  Oi River
  The is a river in Shizuoka Prefecture, Japan.-Geography:The Ōi River flows from the Akaishi Mountains, the branch of the Japanese Southern Alps which form the border between Shizuoka, Nagano and Yamanashi prefectures. These mountains, with peaks ranging from 2000–3000 meters, are characterized by...
  
   (大井川) - Shizuoka
• Tenryū-gawa
  Tenryu River
  The is a river arising from Lake Suwa in Okaya, Nagano Prefecture, grazing Aichi Prefecture and flowing through western Shizuoka Prefecture in central Honshū, Japan. With a length of , it is Japan's ninth longest river.-Geography:...
  
   (天竜川) - Nagano, Aichi, Shizuoka
• Toyo-gawa (豊川) - Aichi
• Yahagi-gawa
  Yahagi River
  The is a river that flows from Nagano Prefecture's Mount Ōkawairi, through Gifu Prefecture, and enters Mikawa Bay from Aichi Prefecture in Japan. It is one of Japan's first-class rivers.-Geography:...
  
   (矢作川) - Nagano, Gifu, Aichi
• Shōnai-gawa
  Shonai River
  The is a Class 1 river flowing through Gifu and Aichi prefectures in Japan. In Gifu Prefecture, it is also referred to as the Toki River ; around the city of Kasugai in Aichi Prefecture, it is referred to as the Tamano River .-Geography:The river originates at Mount Yūdachi in Ena, Gifu Prefecture...
  
   (庄内川) - Gifu, Aichi
• Kiso-gawa
  Kiso River
  The is a river in Japan roughly 193 km long, flowing through the prefectures of Nagano, Gifu, Aichi, and Mie before emptying into Ise Bay a short distance away from the city of Nagoya. It is the main river of the Kiso Three Rivers and forms a major part of the Nōbi Plain...
  
   (木曽川) - Nagano, Gifu, Aichi, Mie
• Nagara-gawa
  Nagara River
  The has its source in the city of Gujō, Gifu Prefecture, and its mouth in the city of Kuwana, Mie Prefecture, Japan. Along with the Kiso River and Ibi River, the Nagara River is one of the Kiso Three Rivers of the Nōbi Plain. Previously, the river was named Sunomata River . With a length of , it...
  
   (長良川) - Gifu, Aichi, Mie
• Ibi-gawa
  Ibi River
  The is a tributary of the Kiso River located in Gifu and Mie Prefectures in Japan. Along with the Nagara and Kiso rivers, the Ibi is the third of the Kiso Three Rivers of the Nōbi Plain. It is one of Japan's first-class rivers...
  
   (揖斐川) -Gifu, Mie
• Kushida-gawa
  Kushida River
  The is a major river that flows through central Mie Prefecture on the island of Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government, one of four Class 1 rivers that flow solely through Mie. The majority of river's course is through the city of Matsusaka.The...
  
   (櫛田川) - Mie
• Miya-gawa
  Miya River (Mie)
  The is a major river that flows through central Mie Prefecture on the island of Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government and is one of four Class 1 rivers that flow solely through Mie; it is the longest among these four.It is known to be especially...
  
   (宮川) - Mie

First class rivers under control of Chubu Regional Bureau (中部地方整備局)

• Kano-gawa 狩野川 - Shizuoka
• Abe-kawa 安倍川 - Shizuoka
• Ōi-gawa
  Oi River
  The is a river in Shizuoka Prefecture, Japan.-Geography:The Ōi River flows from the Akaishi Mountains, the branch of the Japanese Southern Alps which form the border between Shizuoka, Nagano and Yamanashi prefectures. These mountains, with peaks ranging from 2000–3000 meters, are characterized by...
  
   大井川 - Shizuoka
• Kiku-gawa 菊川 - Shizuoka
• Tenryū-gawa
  Tenryu River
  The is a river arising from Lake Suwa in Okaya, Nagano Prefecture, grazing Aichi Prefecture and flowing through western Shizuoka Prefecture in central Honshū, Japan. With a length of , it is Japan's ninth longest river.-Geography:...
  
   天竜川 - Nagano, Aichi, Shizuoka
• Toyo-gawa 豊川 - Aichi
• Yahagi-gawa
  Yahagi River
  The is a river that flows from Nagano Prefecture's Mount Ōkawairi, through Gifu Prefecture, and enters Mikawa Bay from Aichi Prefecture in Japan. It is one of Japan's first-class rivers.-Geography:...
  
   矢作川 - Nagano, Gifu, Aichi
• Shōnai-gawa
  Shonai River
  The is a Class 1 river flowing through Gifu and Aichi prefectures in Japan. In Gifu Prefecture, it is also referred to as the Toki River ; around the city of Kasugai in Aichi Prefecture, it is referred to as the Tamano River .-Geography:The river originates at Mount Yūdachi in Ena, Gifu Prefecture...
  
   庄内川 - Gifu, Aichi
• Kiso-gawa
  Kiso River
  The is a river in Japan roughly 193 km long, flowing through the prefectures of Nagano, Gifu, Aichi, and Mie before emptying into Ise Bay a short distance away from the city of Nagoya. It is the main river of the Kiso Three Rivers and forms a major part of the Nōbi Plain...
  
   木曽川 - Nagano, Gifu, Shiga, Aichi, Mie
• Suzuka-gawa
  Suzuka River
  The is a major river that flows through northern Mie Prefecture on the island of Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government, one of four Class 1 rivers that flow solely through Mie....
  
   鈴鹿川 - Mie
• Kumozu-gawa 雲出川 - Mie
• Kushida-gawa
  Kushida River
  The is a major river that flows through central Mie Prefecture on the island of Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government, one of four Class 1 rivers that flow solely through Mie. The majority of river's course is through the city of Matsusaka.The...
  
   櫛田川 - Mie
• Miya-gawa
  Miya River (Mie)
  The is a major river that flows through central Mie Prefecture on the island of Honshū, Japan. It is officially classified as a Class 1 river by the Japanese government and is one of four Class 1 rivers that flow solely through Mie; it is the longest among these four.It is known to be especially...
  
   宮川 - Mie

Kansai

Kansai

The or the lies in the southern-central region of Japan's main island Honshū. The region includes the prefectures of Mie, Nara, Wakayama, Kyoto, Osaka, Hyōgo, and Shiga. Depending on who makes the distinction, Fukui, Tokushima and even Tottori Prefecture are also included...

 

The first class rivers under the control of Kinki Regional Bureau (近畿地方整備局)

• Kuzuryu-gawa
  Kuzuryu River
  The is a river flowing through Fukui Prefecture, Japan. It has its source at the Aburasaka Pass in the city of Ōno and empties into the Sea of Japan near the city of Sakai.-River system:...
  
   九頭竜川
• Kita-gawa 北川 - Shiga, Fukui
• Yura-gawa :ja:由良川 - Hyogo, Kyoto
• Yodo-gawa (淀川), Seta-gawa (瀬田川) or Uji-gawa (宇治川)
  • Yasu-gawa
    Yasu River
    The is located in Shiga Prefecture, Japan; it is the largest river to flow into Lake Biwa. It rises from Mount Gozaisho and flows through Kōka, Konan, Rittō, Moriyama and Yasu...
    
     (野洲川)
  • Katsura-gawa
    Katsura River
    The is a continuation of two other rivers, the Hozu River, a small, speedy river which begins in the mountains near Kameoka and then slithers through the mountains separating Kameoka and Kyoto; and the Ōi River , which emerges from those mountains and expands into a shallow, slow-flowing river...
    
     (桂川), Hozu-gawa (保津川) or Ōi-gawa (大堰川)
  • Kamo-gawa
    Kamo River
    The is located in Kyoto Prefecture, Japan. The riverbanks are popular walking spots for residents and tourists. In summer, restaurants open balconies looking out to the river. There are pathways running alongside the river on which one can walk along the river, and some stepping stones that cross...
    
     (鴨川)
  • Kizu-gawa (木津川)
  • Dōton-bori (道頓堀)
• Yamato-gawa (大和川) - Nara, Osaka
• Maruyama-gawa (円山川) - Hyogo
• Kako-gawa (加古川) - Hyogo
• Ibo-gawa (揖保川) - Hyogo
• Ki-no-kawa
  Kinokawa River
  The is a river in Nara and Wakayama Prefecture in Japan. It is called in Nara. It is 136 km long and has a watershed of 1,660 km².The river rises from Mount Ōdaigahara and flows to the west. It pours into the sea at Wakayama city.-Geography:...
  
   (紀ノ川, 紀の川) - Nara, Wakayama
• Yamato-gawa (大和川) - Nara, Osaka
• Kumano-gawa (熊野川) or Shingu-gawa (新宮川)- Nara, Mie, Wakayama

The second class river

• Muko-gawa (武庫川)

Chūgoku 

First class rivers under control of Chugoku Regional Bureau (中国地方整備局)

• Sendai-gawa (千代川) - Tottori
• Tenjin-gawa (天神川) - Tottori
• Hino-gawa (日野川) - Tottori
• Hii-kawa (斐伊川) - Shimane, Tottori
• Gō-no-kawa, or Gō-gawa (江の川, 江川) - Hiroshima, Shimane
• Takatsu-gawa (高津川) - Shimane
• Yoshii-gawa 吉井川 - Okayama
• Asahi-gawa 旭川 - Okayama
• Takahashi-gawa
  Takahashi River
  The is a major river in the western part of Okayama Prefecture, and acts as the main drainage for the Takahashi River Drainage System, and is one of the three main drainage rivers in Okayama Prefecture ....
  
   (高梁川) - Hiroshima, Okayama
• Ashida-gawa 芦田川 - Okayama, Hiroshima
• Ōta-gawa
  Ota River
  is one of the most famous and beautiful rivers in Japan.- Overview :Ōta River is a 103 kilometer- long river as its main stream from . The Ōta River is the major river that flows through Hiroshima Prefecture and empties into the Seto Inland Sea...
  
   (太田川) - Hiroshima
• Ose-gawa 小瀬川 - Hiroshima, Yamaguchi
• Saba-gawa 佐波川 - Yamaguchi

Shikoku

Shikoku

is the smallest and least populous of the four main islands of Japan, located south of Honshū and east of the island of Kyūshū. Its ancient names include Iyo-no-futana-shima , Iyo-shima , and Futana-shima...

 

First class rivers under control of Shikoku Regional Bureau (四国地方整備局)

• Yoshino-gawa
  Yoshino River
  The Yoshino River is a river on the island of Shikoku, Japan. It is 194 km long and has a watershed of 3,750 km². It is the second longest river in Shikoku , and is the only river whose watershed spreads over the four prefectures of the island.It is regarded as one of the three greatest rivers of...
  
   (吉野川) - Kochi, Ehime, Tokushima, Kagawa
• Naka-gawa 那賀川 - Tokushima
• Doki-gawa 土器川 - Kagawa
• Shigenobu-gawa 重信川 - Ehime
• Hiji-kawa :ja:肱川 - Ehime
• Monobe-kawa 物部川 - Kochi 6
• Niyodo-gawa 仁淀川 - Ehime, Kochi
• Shimanto-gawa
  Shimanto River
  The is a river in western Kōchi Prefecture, Japan. 196 km in length, it has a watershed of 2,270 km².Since the river is remote from major cities and does not have any dams, it is sometimes referred to as "the last clear stream of Japan". Fishing and production of nori is a thriving...
  
   (四万十川) - Ehime, Kochi

Kyūshū

Kyushu

is the third largest island of Japan and most southwesterly of its four main islands. Its alternate ancient names include , , and . The historical regional name is referred to Kyushu and its surrounding islands....

 

First class rivers under control of Kyushu Regional Bureau (九州地方整備局)

• Onga-gawa 遠賀川 - Fukuoka
• Yamakuni-gawa 山国川 - Oita, Fukuoka
• Chikugo-gawa
  Chikugo River
  The flows through Kumamoto, Ōita, Fukuoka and Saga prefectures in Japan. With a total length of , it is the longest river on Kyūshū. It flows from Mount Aso and empties into the Ariake Sea. It is also nicknamed "Chikushijirō"...
  
   (筑後川) - Kumamoto, Oita, Fukuoka, Saga
• Yabe-gawa 矢部川 - Fukuoka
• Matsuura-gawa 松浦川 - Saga
• Rokkaku-gawa 六角川 - Saga
• Kase-gawa 嘉瀬川 - Saga
• Honmyo-gawa 本明川 - Nagasaki
• Kikuchi-gawa
  Kikuchi River
  The Kikuchi River flows through the northern part of Kumamoto Prefecture, Kyūshū, Japan. It rises near Mt. Aso and flows west through the Kikuchi Valley. It turns south near Kikusui and empties into the Shimabara Bay. Land reclamation is taking place at its mouth.The river has a total length of...
  
   菊池川 - Kumamoto
• Shira-kawa 白川 - Kumamoto
• Midori-gawa 緑川 - Kumamoto
• Kuma-gawa (球磨川) - Kumamoto
• Ōita-gawa 大分川 - Ōita
• Oono-gawa 大野川 - Kumamoto, Miyazaki, Ōita
• Banjo-gawa 番匠川 - Ōita
• Gokase-gawa 五ヶ瀬川 - Kumamoto, Ōita, Miyazaki
• Omaru-gawa 小丸川 - Miyazaki
• Ōyodo-gawa 大淀川 - Kagoshima, Kumamoto, Miyazaki
• Sendai-gawa 川内川 - Miyazaki, Kagoshima
• Kimotsuki-gawa 肝属川, 肝付川 - Kagoshima