List of longest undammed rivers

This is a list of the longest undammed rivers of the world, ordered by length.

River	Length	Drainage area	Average discharge	Mouth	Notes	Reference	Rank
Amazon River				Atlantic Ocean	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.		1
Lena River				Arctic Ocean	Longest undammed river in Asia.		2
Amur-Shilka-Onon				Strait of Tartary			3
Mackenzie-Slave-Athabasca				Arctic Ocean	The Peace-Finlay system would extend even longer from the head of the Slave but there are dams on the Peace.		4
Nizhnyaya Tunguska River				Yenisei River	The Russian government is planning to build hydro dams on the river within the next few years.		5
Salween River				Andaman Sea	Longest undammed Southeast Asian river. Burma is planning to build the Tasang Dam and several others.		6
Paraguay River				Paraná River			7
Amu Darya-Panj				Aral Sea	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
Aldan River				Lena River
Rio Negro				Amazon River
Vitim River				Lena River
Indigirka River				Arctic Ocean
Fraser River				Pacific Ocean
Kuskokwim River				Bering Sea
Back River				Arctic Ocean
Anadyr River				Gulf of Anadyr
Liard River				Mackenzie River
Yellowstone River				Missouri River	Longest undammed river in the contiguous United States.
Maya River				Aldan River
Fly River				Gulf of Papua	Largest completely undammed river system in the world		-
White River				Missouri River		-	-
Tanana River				Yukon River
Thelon River				Hudson Bay
Salmon River				Snake River
Stikine River				Pacific Ocean
Skeena River				Pacific Ocean
Susitna River				Pacific Ocean	Alaska is planning to build a hydroelectric dam on the river at Devil's Canyon.