Open Book

Amazon :

 Brazil, Peru, Bolivia, Colombia, Ecuador, Venezuela, Guyana, Suriname, French Guiana

Congo/Zaire :

Dem. Rep. of Congo, Central African Republic, Angola, Congo, Zambia, United Republic of Tanzania, Cameroon, Burundi, Rwanda, Sudan, Gabon, Malawi, Uganda

Mississippi:

 United States of America, Canada

Nile:

 Sudan, Ethiopia, Egypt, Udanda, United Republic of Tanzania, Kenya, Dem. Rep. of Congo, Rwanda, Burundi, Eritrea, Central African Republic

La Plata:

 Brazil, Argentina, Paraguay, Bolivia, Uruguay

Ob:

 Russia, Kazakhstan, China, Mongolia

Jenisej/Yenisez:

 Russia, Mongolia

Lake Chad :

Chad, Niger, Central African Republic, Nigeria, Algeria, Sudan, Cameroon, Libya

Niger:

 Nigeria, Mali, Niger, Algeria, Guinea, Cameroon, Burkina Faso, Benin, Ivory Coast, Chad, Sierra Leone

Amur:

 Russia, China, Mongolia, Dem. People's Republic of Korea

Ganges-Brahmaputra-Meghna:

 India, China, Nepal, Bangladesh, Bhutan, Myanmar

Volga:

 Russia, Kazakhstan, Belarus

Zambezi :

Zambia, Angola, Zimbabwe, Mozambique, Malawi, United Republic of Tanzania, Botswana, Namibia, Dem. Rep. of Congo

Aral See:

 Kazakhstan, Uzbekistan, Tajikistan, Kyrgyzstan, Afghanistan, Turkmenistan, China, Pakistan

Indus:

 Pakistan, India, China, Afghanistan, Nepal

Nelson-Saskatchewan:

 Canada, United States of America

St. Lawrence :

Canada, United States of America

Tarim:

 China, Kyrgyzstan, Tajikistan, Pakistan, Afghanistan

Orange:

 South Africa, Namibia, Botswana, Lesotho

Orinoco:

 Venezuela, Colombia, Brazil

Yukon:

 United States of America, Canada

Juba-Shibeli:

 Ethiopia, Somalia, Kenya

Danube:

 Romania, Hungary, Austria, Serbia, Montenegro, Germany, Slovakia, Bulgaria, Bosnia and Herzegovina, Croatia, Ukraine, Czech Republic, Slovenia, Moldova, Switzerland, Italy, Poland, Albania

Tigirs-Euphrates/Shatt al Arab:

 Iraq, Turkey, Iran, Syria, Jordan, Saudi Arabia

Mekong:

 People's Democratic Republic of Laos, Thailand, china, Cambodia, Vietnam, Myanmar

Okavango :

Bostwana, Namibia, Angola, Zimbabwe

Columbia :

United States of America, Canada

Rio Grande:

 United States of America, Mexico

Dniepr:

 Ukraine, Belarus, Russia

 Senegal:

 Mauritania, Mali, Senegal, Gambia

Don:

 Russia, Ukraine

Bei Jian/His :

China, Vietnam

Limpopo:

 South Africa, Mozambique, Botswana, Zimbabwe

Volta:

 Burkina Faso, Ghana, Togo, Mali, Benin, Cote d'Ivoire

Irrawaddy:

 Myanmar, China, India