A transboundary river is a river that crosses at least one political border, either a border within a state or an international boundary. Bangladesh has the highest number of these rivers, with at least 58 major rivers that enter the country from the Republic of India, including two of the world's largest rivers, the Brahmaputra and the Ganges. The Naf River is the only river that flows via Bangladesh into Myanmar.
The hydrologic and political effects of rivers that cross significant boundaries are enormous. Rivers have positive effects in that they carry a significant amount of sediment, which aids in building land in estuarine regions. However, this sediment raises the height of riverbeds, thereby causing flooding. International conventions governing water sharing have led to complex political disputes.[1]
| River
|
Length (km)
|
Countries
|
| Amazon
|
7,800
|
 Brazil
 Colombia
File:Flag of Peru.svg Peru
|
| Brahmaputra
|
3,848
|
File:Flag of Bangladesh.svg Bangladesh
File:Flag of the People's Republic of China.svg China
 India
|
| Colorado
|
2,333
|
 Mexico
File:Flag of the United States.svg United States
|
| Columbia
|
2,000
|
File:Flag of Canada (Pantone).svg Canada
File:Flag of the United States.svg United States
|
| Danube
|
2,860
|
File:Flag of Austria.svg Austria
File:Flag of Bulgaria.svg Bulgaria
File:Flag of Croatia.svg Croatia
File:Flag of Germany.svg Germany
File:Flag of Hungary.svg Hungary
File:Flag of Moldova.svg Moldova
File:Flag of Romania.svg Romania
File:Flag of Serbia.svg Serbia
File:Flag of Slovakia.svg Slovakia
File:Flag of Ukraine.svg Ukraine
|
| Daugava
|
1,020
|
File:Flag of Belarus.svg Belarus
File:Flag of Latvia.svg Latvia
File:Flag of Russia.svg Russia
|
| Dnipro
|
2,200
|
File:Flag of Belarus.svg Belarus
File:Flag of Russia.svg Russia
File:Flag of Ukraine.svg Ukraine
|
| Euphrates
|
2,800
|
File:Flag of Iraq.svg Iraq
File:Flag of Syria (2025-).svg Syria
File:Flag of Turkey.svg Turkey
|
| Ganges
|
3,084
|
File:Flag of Bangladesh.svg Bangladesh
India
|
| Ichamati
|
334
|
File:Flag of Bangladesh.svg Bangladesh
India
|
| Indus
|
3,500
|
File:Flag of the People's Republic of China.svg China
India
File:Flag of Pakistan.svg Pakistan
|
| Irrawaddy
|
2,210
|
File:Flag of the People's Republic of China.svg China
File:Flag of Myanmar.svg Myanmar
|
| Mekong
|
4,350
|
File:Flag of Cambodia.svg Cambodia
File:Flag of the People's Republic of China.svg China
File:Flag of Laos.svg Laos
File:Flag of Myanmar.svg Myanmar
File:Flag of Thailand.svg Thailand
File:Flag of Vietnam.svg Vietnam
|
| Meuse
|
925
|
File:Flag of Belgium (civil).svg Belgium
File:Flag of France.svg France
File:Flag of the Netherlands.svg Netherlands
|
| Niger
|
4,180
|
File:Flag of Benin.svg Benin
File:Flag of Guinea.svg Guinea
File:Flag of Mali.svg Mali
File:Flag of Niger.svg Niger
File:Flag of Nigeria.svg Nigeria
|
| Nile
|
7,088
|
File:Flag of Burundi.svg Burundi
File:Flag of the Democratic Republic of the Congo.svg DR Congo
File:Flag of Egypt.svg Egypt
File:Flag of Eritrea.svg Eritrea
File:Flag of Ethiopia.svg Ethiopia
File:Flag of Kenya.svg Kenya
File:Flag of Rwanda.svg Rwanda
File:Flag of South Sudan.svg South Sudan
File:Flag of Sudan.svg Sudan
File:Flag of Tanzania.svg Tanzania
File:Flag of Uganda.svg Uganda
|
| Rhine
|
1,230
|
File:Flag of Austria.svg Austria
File:Flag of France.svg France
File:Flag of Germany.svg Germany
File:Flag of Liechtenstein.svg Liechtenstein
File:Flag of the Netherlands.svg Netherlands
File:Flag of Switzerland (Pantone).svg Switzerland
|
| Rhône
|
813
|
File:Flag of France.svg France
File:Flag of Switzerland (Pantone).svg Switzerland
|
| Rio Grande
|
3,051
|
Mexico
File:Flag of the United States.svg United States
|
| St. Lawrence
|
500
|
File:Flag of Canada (Pantone).svg Canada
File:Flag of the United States.svg United States
|
| Tagus
|
1,007
|
File:Flag of Portugal (official).svg Portugal
File:Flag of Spain.svg Spain
|
| Tigris
|
1,850
|
File:Flag of Iraq.svg Iraq
File:Flag of Syria (2025-).svg Syria
File:Flag of Turkey.svg Turkey
|
| Yukon
|
3,190
|
File:Flag of Canada (Pantone).svg Canada
File:Flag of the United States.svg United States
|
| Zambezi
|
2,474
|
File:Flag of Angola.svg Angola
File:Flag of Botswana.svg Botswana
File:Flag of Mozambique.svg Mozambique
File:Flag of Namibia.svg Namibia
File:Flag of Zambia.svg Zambia
File:Flag of Zimbabwe.svg Zimbabwe
|
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