This is a list of the longest undammed rivers of the world, ordered by length. {, class="wikitable sortable" ! !River !data-sort-type = number, Length !data-sort-type = number,

Drainage area A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, t ...

!data-sort-type = number, Average discharge (m³/s) !Mouth !Notes !Reference !Rank , - , bgcolor="#FFEBAD", , Amazon River , bgcolor="#4169E1",
, , , Atlantic Ocean , Second-longest and largest river in the world, undammed as well as unbridged, does not form a

delta Delta commonly refers to: * Delta (letter) (Δ or δ), a letter of the Greek alphabet * River delta, at a river mouth * D ( NATO phonetic alphabet: "Delta") * Delta Air Lines, US * Delta variant of SARS-CoV-2 that causes COVID-19 Delta may also ...

while joining the sea due to adequate thrust of river water to overcome the sea water wave and tidal thrusts. , , 1 , - , bgcolor="#FFCBCB", , Lena River , bgcolor="#7B68EE", , , ,

Arctic Ocean The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, a ...

, Longest undammed river in Asia. , , 2 , - , bgcolor="#FFCBCB", ,

Amur The Amur (russian: река́ Аму́р, ), or Heilong Jiang (, "Black Dragon River", ), is the world's tenth longest river, forming the border between the Russian Far East and Northeastern China ( Inner Manchuria). The Amur proper is long, ...

– Shilka–

Onon Onon may refer to: * Onon (river), river in Mongolia and Russia * Onon, Khentii, town in the Khentii Province of Mongolia * Onon (crater), crater on Mars named after the river {{disambig ...

, bgcolor="#7B68EE", , , , Strait of Tartary , , , 3 , - , bgcolor="#CCFFFF" , ,

Mackenzie Mackenzie, Mckenzie, MacKenzie, or McKenzie may refer to: People * Mackenzie (given name), a given name (including a list of people with the name) * Mackenzie (surname), a surname (including a list of people with the name) * Clan Mackenzie, a S ...

– Slave–

Athabasca Athabasca (also Athabaska) is an anglicized version of the Cree name for Lake Athabasca in Canada, āthap-āsk-ā-w (pronounced ), meaning "grass or reeds here and there". Most places named Athabasca are found in Alberta, Canada. Athabasca may a ...

, bgcolor="#7B68EE" , , , ,

, The

Peace Peace is a concept of societal friendship and harmony in the absence of hostility and violence. In a social sense, peace is commonly used to mean a lack of conflict (such as war) and freedom from fear of violence between individuals or groups. ...

–

Finlay Finlay is a masculine given name, and also a surname. The given name is represented in Scottish Gaelic as Fionnlagh. Given name Finlay * Finlay Mickel, Scottish skier *Finlay Currie (1878–1968), Scottish actor * Finlay Calder, Scottish rugby pl ...

system would extend even longer from the head of the Slave but there are dams on the Peace. , , 4 , - , bgcolor="#FFCBCB" , ,

Nizhnyaya Tunguska River The Nizhnyaya Tunguska ( rus, Ни́жняя Тунгу́ска, p=ˈnʲiʐnʲɪjə tʊnˈɡuskə, meaning "Lower Tunguska") is a river in Siberia, Russia, that flows through the Irkutsk Oblast and the Krasnoyarsk Krai. The river is a right tribut ...

, bgcolor="#1E90FF" , , , ,

Yenisei River The Yenisey (russian: Енисе́й, ''Yeniséy''; mn, Горлог мөрөн, ''Gorlog mörön''; Buryat: Горлог мүрэн, ''Gorlog müren''; Tuvan: Улуг-Хем, ''Uluğ-Hem''; Khakas: Ким суғ, ''Kim suğ''; Ket: Ӄук, ...

, The Russian government is planning to build hydro dams on the river within the next few years. , , 5 , - , bgcolor="#FFCBCB" , ,

Salween River , ''Mae Nam Salawin'' ( , name_etymology = , image = Sweet_View_of_Salween_River_in_Tang_Yan_Township,_Shan_State,_Myanmar.jpg , image_size = , image_caption = Salween River in Shan State, Myanmar , map ...

, bgcolor="#1E90FF" , , , , Andaman Sea , Longest undammed

Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical south-eastern region of Asia, consisting of the regions that are situated south of mainlan ...

n river.

Burma Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John Wells explai ...

is planning to build the Tasang Dam and several others. , , 6 , - , bgcolor="#FFEBAD" , ,

Paraguay River The Paraguay River (Río Paraguay in Spanish, Rio Paraguai in Portuguese, Ysyry Paraguái in Guarani) is a major river in south-central South America, running through Brazil, Bolivia, Paraguay and Argentina. It flows about from its headwaters i ...

, bgcolor="#1E90FF" , , , , Paraná River , , , 7 , - , bgcolor="#FFCBCB", ,

Amu Darya The Amu Darya, tk, Amyderýa/ uz, Amudaryo// tg, Амударё, Amudaryo ps, , tr, Ceyhun / Amu Derya grc, Ὦξος, Ôxos (also called the Amu, Amo River and historically known by its Latin name or Greek ) is a major river in Central Asi ...

–

Panj Panj () is a city in southern Tajikistan which is situated on the Afghan border, some south of the capital Dushanbe. It is located along the north bank of the river Panj, from which it derives its name. The population of the town is 12,500 (Jan ...

, bgcolor="#1E90FF", , , , Aral Sea (former) , Although undammed, heavy diversion through canals causes the river to frequently dry up without reaching its mouth. Tajikistan is planning to build a hydroelectric dam on the Panj River. , , 8 , - , bgcolor="#FFCBCB", ,

Aldan River The Aldan (russian: Алдан) is the second-longest, right tributary of the Lena in the Sakha Republic in eastern Siberia.Lena River , , , , - , bgcolor="#FFEBAD", , Rio Negro , bgcolor="#1E90FF", , , , Amazon River , , , , - , bgcolor="#FFCBCB", ,

Vitim River The Vitim (russian: Витим; evn, Витым, ; sah, Виитим, ; Buryat and mn, Витим, ''Vitim'') is a major tributary of the Lena. Its source is east of Lake Baikal, at the confluence of rivers Vitimkan from the west and China f ...

, bgcolor="#6495ED", , , , Lena River , , , , - , bgcolor="#FFCBCB", ,

Indigirka River The Indigirka ( rus, Индиги́рка, r=; sah, Индигиир, translit=Indigiir) is a river in the Sakha Republic in Russia between the Yana to the west and the Kolyma to the east. It is long. The area of its basin is . History The i ...

, bgcolor="#6495ED", , , ,

, , , , - , bgcolor="#CCFFFF", , Fraser River , bgcolor="#6495ED", , , , Pacific Ocean , , , , - , bgcolor="#CCFFFF", ,

Kuskokwim River The Kuskokwim River or Kusko River ( Yup'ik: ''Kusquqvak''; Deg Xinag: ''Digenegh''; Upper Kuskokwim: ''Dichinanek' ''; russian: Кускоквим (''Kuskokvim'')) is a river, long, in Southwest Alaska in the United States. It is the ninth l ...

, bgcolor="#6495ED", , , , Bering Sea , , , , - , bgcolor="#CCFFFF", , Back River , bgcolor="#6495ED", , , ,

, , , , - , bgcolor="#FFCBCB", ,

Anadyr River The Anadyr (russian: Ана́дырь; Yukaghir: Онандырь; ckt, Йъаайваам) is a river in the far northeast of Siberia which flows into the Gulf of Anadyr of the Bering Sea and drains much of the interior of Chukotka Autonomous ...

, bgcolor="#6495ED", , , ,

Gulf of Anadyr The Gulf of Anadyr, or Anadyr Bay (russian: Анадырский залив), is a large bay on the Bering Sea in far northeast Siberia. It has a total surface area of Location The bay is roughly rectangular and opens to the southeast. The corn ...

, , , , - , bgcolor="#CCFFFF", , Liard River , bgcolor="#6495ED", , , , Mackenzie River , , , , - , bgcolor="#CCFFFF", ,

Yellowstone River The Yellowstone River is a tributary of the Missouri River, approximately long, in the Western United States. Considered the principal tributary of upper Missouri, via its own tributaries it drains an area with headwaters across the mountains a ...

, bgcolor="#6495ED", , , , Missouri River , Longest undammed river in the contiguous United States. , , , - , bgcolor="#FFCBCB", ,

Maya River The Maya (russian: Мая) is a river in Khabarovsk Krai and Sakha, Russia. It is a right tributary of the Aldan of the Lena basin. The length of the river is . The area of its basin . The Maya freezes up in late October and stays under the ice ...

, bgcolor="#6495ED", , , ,

Aldan River The Aldan (russian: Алдан) is the second-longest, right tributary of the Lena in the Sakha Republic in eastern Siberia.Missouri River , , - , bgcolor="#CCFFFF", , Tanana River , bgcolor="#00BFFF", , , , Yukon River , , , , - , bgcolor="#CCFFFF", , Thelon River , bgcolor="#00BFFF", , , , Hudson Bay , , , , - , bgcolor="#CCFFFF", , Salmon River (Idaho), Salmon River , bgcolor="#00BFFF", , , , Snake River , , , , - , bgcolor="#CCFFFF", , Stikine River , bgcolor="#00BFFF", , , , Pacific Ocean , , , , - , bgcolor="#CCFFFF", , Skeena River , bgcolor="#00BFFF", , , , Pacific Ocean , , , , - , bgcolor="#CCFFFF", , Susitna River , bgcolor="#00BFFF", , , {{convert, 1400, m3/s, cuft/s, abbr=on , Pacific Ocean , Alaska is planning to build a hydroelectric dam on the river at Devil's Canyon. , ,

See also