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River
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Length
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Drainage area
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Average discharge (m³/s)
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Mouth
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Notes
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Reference
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Rank
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Amazon River
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6,937 km (4,310 mi)
6,992 km (4,345 mi)
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7,050,000 km2 (2,720,000 sq mi)
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219,000 m3/s (7,700,000 cu ft/s)
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Atlantic Ocean
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Second-longest and largest river in the world, undammed as well as unbridged, does not form a delta while joining the sea due to adequate thrust of river water to overcome the sea water wave and tidal thrusts.
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1
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Lena River
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4,472 km (2,779 mi)
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2,500,000 km2 (970,000 sq mi)
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17,000 m3/s (600,000 cu ft/s)
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Arctic Ocean
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Longest undammed river in Asia.
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2
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|
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Amur–Shilka–Onon
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4,197 km (2,608 mi)
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1,855,000 km2 (716,000 sq mi)
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11,700 m3/s (410,000 cu ft/s)
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Strait of Tartary
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3
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Mackenzie–Slave–Athabasca
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3,403 km (2,115 mi)
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1,805,200 km2 (697,000 sq mi)
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10,700 m3/s (380,000 cu ft/s)
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Arctic Ocean
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The Peace–Finlay system would extend even longer from the head of the Slave but there are dams on the Peace.
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4
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|
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Nizhnyaya Tunguska River
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2,989 km (1,857 mi)
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473,000 km2 (183,000 sq mi)
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3,680 m3/s (130,000 cu ft/s)
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Yenisei River
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The Russian government is planning to build hydro dams on the river within the next few years.
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5
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Salween River
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2,815 km (1,749 mi)
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324,000 km2 (125,000 sq mi)
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6,700 m3/s (240,000 cu ft/s)
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Andaman Sea
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Longest undammed Southeast Asian river. Burma is planning to build the Tasang Dam and several others.
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6
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|
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Paraguay River
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2,549 km (1,584 mi)
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1,150,000 km2 (440,000 sq mi)
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4,550 m3/s (161,000 cu ft/s)
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Paraná River
|
|
|
7
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|
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Amu Darya–Panj
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2,500 km (1,600 mi)
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534,700 km2 (206,400 sq mi)
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1,330 m3/s (47,000 cu ft/s)
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Aral Sea (former)
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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.
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8
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Aldan River
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2,273 km (1,412 mi)
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729,000 km2 (281,000 sq mi)
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5,060 m3/s (179,000 cu ft/s)
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Lena River
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|
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Rio Negro
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2,230 km (1,390 mi)
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691,000 km2 (267,000 sq mi)
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29,300 m3/s (1,030,000 cu ft/s)
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Amazon River
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|
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Vitim River
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1,978 km (1,229 mi)
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Lena River
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|
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Indigirka River
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1,726 km (1,072 mi)
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360,400 km2 (139,200 sq mi)
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1,810 m3/s (64,000 cu ft/s)
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Arctic Ocean
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|
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Fraser River
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1,375 km (854 mi)
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220,000 km2 (85,000 sq mi)
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3,475 m3/s (122,700 cu ft/s)
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Pacific Ocean
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|
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|
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Kuskokwim River
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1,165 km (724 mi)
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120,000 km2 (46,000 sq mi)
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1,900 m3/s (67,000 cu ft/s)
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Bering Sea
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|
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Back River
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1,150 km (710 mi)
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Arctic Ocean
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Anadyr River
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1,150 km (710 mi)
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191,000 km2 (74,000 sq mi)
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2,020 m3/s (71,000 cu ft/s)
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Gulf of Anadyr
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|
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Liard River
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1,115 km (693 mi)
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277,100 km2 (107,000 sq mi)
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2,434 m3/s (86,000 cu ft/s)
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Mackenzie River
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Yellowstone River
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1,114 km (692 mi)
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181,300 km2 (70,000 sq mi)
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380 m3/s (13,000 cu ft/s)
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Missouri River
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Longest undammed river in the contiguous United States.
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Maya River
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1,053 km (654 mi)
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171,000 km2 (66,000 sq mi)
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1,180 m3/s (42,000 cu ft/s)
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Aldan River
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|
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Fly River
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1,050 km (650 mi)
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76,000 km2 (29,000 sq mi)
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6,500 m3/s (230,000 cu ft/s)
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Gulf of Papua
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Largest completely undammed river system in the world
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White River
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934 km (580 mi)
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26,000 km2 (10,000 sq mi)
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16 m3/s (570 cu ft/s)
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Missouri River
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|
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Tanana River
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916 km (569 mi)
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113,960 km2 (44,000 sq mi)
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1,172 m3/s (41,400 cu ft/s)
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Yukon River
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|
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Thelon River
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900 km (560 mi)
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142,400 km2 (55,000 sq mi)
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Hudson Bay
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|
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Salmon River
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684 km (425 mi)
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36,000 km2 (14,000 sq mi)
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310 m3/s (11,000 cu ft/s)
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Snake River
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|
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Stikine River
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610 km (380 mi)
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52,000 km2 (20,000 sq mi)
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1,580 m3/s (56,000 cu ft/s)
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Pacific Ocean
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|
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Skeena River
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570 km (350 mi)
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54,400 km2 (21,000 sq mi)
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1,760 m3/s (62,000 cu ft/s)
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Pacific Ocean
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Susitna River
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504 km (313 mi)
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52,000 km2 (20,000 sq mi)
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1,400 m3/s (49,000 cu ft/s)
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Pacific Ocean
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Alaska is planning to build a hydroelectric dam on the river at Devil's Canyon.
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