- MCQs on rivers of Afghanistan
- MCQs on rivers of Albania
- MCQs on rivers of Algeria
- MCQs on rivers of Andorra
- MCQs on rivers of Angola
- MCQs on rivers of Antigua and Barbuda
- MCQs on rivers of Argentina
- MCQs on rivers of Armenia
- MCQs on rivers of Australia
- MCQs on rivers of Austria
- MCQs on rivers of Azerbaijan
- MCQs on rivers of The Bahamas
- MCQs on rivers of Bahrain
- MCQs on rivers of Bangladesh
- MCQs on rivers of Barbados
- MCQs on rivers of Belarus
- MCQs on rivers of Belgium
- MCQs on rivers of Belize
- MCQs on rivers of Benin
- MCQs on rivers of Bhutan
- MCQs on rivers of Bolivia
- MCQs on rivers of Bosnia and Herzegovina
- MCQs on rivers of Botswana
- MCQs on rivers of Brazil
- MCQs on rivers of Brunei
- MCQs on rivers of Bulgaria
- MCQs on rivers of Burkina Faso
- MCQs on rivers of Burundi
- MCQs on rivers of Cabo Verde
- MCQs on rivers of Cambodia
- MCQs on rivers of Cameroon
- MCQs on rivers of Canada
- MCQs on rivers of Central African Republic
- MCQs on rivers of Chad
- MCQs on rivers of Chile
- MCQs on rivers of China
- MCQs on rivers of Colombia
- MCQs on rivers of Comoros
- MCQs on rivers of Congo
- MCQs on rivers of Costa Rica
- MCQs on rivers of Côte d’Ivoire
- MCQs on rivers of Croatia
- MCQs on rivers of Cuba
- MCQs on rivers of Cyprus
- MCQs on rivers of Czech Republic
- MCQs on rivers of Denmark
- MCQs on rivers of Djibouti
- MCQs on rivers of Dominica
- MCQs on rivers of Dominican Republic
- MCQs on rivers of East Timor (Timor-Leste)
- MCQs on rivers of Ecuador
- MCQs on rivers of Egypt
- MCQs on rivers of El Salvador
- MCQs on rivers of Equatorial Guinea
- MCQs on rivers of Eritrea
- MCQs on rivers of Estonia
- MCQs on rivers of Eswatini
- MCQs on rivers of Ethiopia
- MCQs on rivers of Fiji
- MCQs on rivers of Finland
- MCQs on rivers of France
- MCQs on rivers of Gabon
- MCQs on rivers of The Gambia
- MCQs on rivers of Georgia
- MCQs on rivers of Germany
- MCQs on rivers of Ghana
- MCQs on rivers of Greece
- MCQs on rivers of Grenada
- MCQs on rivers of Guatemala
- MCQs on rivers of Guinea
- MCQs on rivers of Guinea-Bissau
- MCQs on rivers of Guyana
- MCQs on rivers of Haiti
- MCQs on rivers of Honduras
- MCQs on rivers of Hungary
- MCQs on rivers of Iceland
- MCQs on rivers of India
- MCQs on rivers of Indonesia
- MCQs on rivers of Iran
- MCQs on rivers of Iraq
- MCQs on rivers of Ireland
- MCQs on rivers of Israel
- MCQs on rivers of Italy
- MCQs on rivers of Jamaica
- MCQs on rivers of Japan
- MCQs on rivers of Jordan
- MCQs on rivers of Kazakhstan
- MCQs on rivers of Kenya
- MCQs on rivers of Kiribati
- MCQs on rivers of Korea, North
- MCQs on rivers of Korea, South
- MCQs on rivers of Kosovo
- MCQs on rivers of Kuwait
- MCQs on rivers of Kyrgyzstan
- MCQs on rivers of Laos
- MCQs on rivers of Latvia
- MCQs on rivers of Lebanon
- MCQs on rivers of Lesotho
- MCQs on rivers of Liberia
- MCQs on rivers of Libya
- MCQs on rivers of Liechtenstein
- MCQs on rivers of Lithuania
- MCQs on rivers of Luxembourg
- MCQs on rivers of Madagascar
- MCQs on rivers of Malawi
- MCQs on rivers of Malaysia
- MCQs on rivers of Maldives
- MCQs on rivers of Mali
- MCQs on rivers of Malta
- MCQs on rivers of Marshall Islands
- MCQs on rivers of Mauritania
- MCQs on rivers of Mauritius
- MCQs on rivers of Mexico
- MCQs on rivers of Micronesia
- MCQs on rivers of Moldova
- MCQs on rivers of Monaco
- MCQs on rivers of Mongolia
- MCQs on rivers of Montenegro
- MCQs on rivers of Morocco
- MCQs on rivers of Mozambique
- MCQs on rivers of Myanmar (Burma)
- MCQs on rivers of Namibia
- MCQs on rivers of Nauru
- MCQs on rivers of Nepal
- MCQs on rivers of Netherlands
- MCQs on rivers of New Zealand
- MCQs on rivers of Nicaragua
- MCQs on rivers of Niger
- MCQs on rivers of Nigeria
- MCQs on rivers of North Macedonia
- MCQs on rivers of Norway
- MCQs on rivers of Oman
- MCQs on rivers of Pakistan
- MCQs on rivers of Palau
- MCQs on rivers of Panama
- MCQs on rivers of Papua New Guinea
- MCQs on rivers of Paraguay
- MCQs on rivers of Peru
- MCQs on rivers of Philippines
- MCQs on rivers of Poland
- MCQs on rivers of Portugal
- MCQs on rivers of Qatar
- MCQs on rivers of Romania
- MCQs on rivers of Russia
- MCQs on rivers of Rwanda
- MCQs on rivers of Saint Kitts and Nevis
- MCQs on rivers of Saint Lucia
- MCQs on rivers of Saint Vincent and the Grenadines
- MQCs on rivers of Samoa
- MCQs on rivers of San Marino
- MCQs on rivers of Sao Tome and Principe
- MCQs on rivers of Saudi Arabia
- MCQs on rivers of Senegal
- MCQs on rivers of Serbia
- MCQs on rivers of Seychelles
- MCQs on rivers of Sierra Leone
- MCQs on rivers of Singapore
- MCQs on rivers of Slovakia
- MCQs on rivers of Slovenia
- MCQs on rivers of Solomon Islands
- MCQs on rivers of Somalia
- MCQs on rivers of South Africa
- MCQs on rivers of Spain
- MCQs on rivers of Sri Lanka
- MCQs on rivers of Sudan
- MCQs on rivers of Sudan, South
- MCQs on rivers of Suriname
- MCQs on rivers of Sweden
- MCQs on rivers of Switzerland
- MCQs on rivers of Syria
- MCQs on rivers of Taiwan
- MCQs on rivers of Tajikistan
- MCQs on rivers of Tanzania
- MCQs on rivers of Thailand
- MCQs on rivers of Togo
- MCQs on rivers of Tonga
- MCQs on rivers of Trinidad and Tobago
- MCQs on rivers of Tunisia
- MCQs on rivers of Turkey
- MCQs on rivers of Turkmenistan
- MCQs on rivers of Tuvalu
- MCQs on rivers of Uganda
- MCQs on rivers of Ukraine
- MCQs on rivers of United Arab Emirates
- MCQs on rivers of United Kingdom
- MCQs on rivers of United States
- MCQs on rivers of Uruguay
- MCQs on rivers of Uzbekistan
- MCQs on rivers of Vanuatu
- MCQs on rivers of Vatican City
- MCQs on rivers of Venezuela
- MCQs on rivers of Vietnam
- MCQs on rivers of Yemen
- MCQs on rivers of Zambia
- MCQs on rivers of Zimbabwe