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Hint
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Answer
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Brazil, Paraguay, Argentina
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Parana
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Uganda, South Sudan, Sudan, Egypt
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Nile
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Germany, Hungary, Romania
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Danube
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China, Laos, Vietnam
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Mekong
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Russia, Belarus, Ukraine
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Dnieper
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Turkey, Syria, Iraq
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Euphrates/Tigris
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China, India, Pakistan
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Indus
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Guinea, Mali, Nigeria
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Niger
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Switzerland, Germany, Netherlands
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Rhine
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Zambia, Zimbabwe, Mozambique
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Zambezi
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Quebec, Ontario, New York
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St. Lawrence
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British Columbia, Washington, Oregon
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Columbia
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New South Wales, Victoria, South Australia
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Murray
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Bourgogne-Franche-Comté, Île-de-France, Normandy
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Seine
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Tuscany, Umbria, Lazio
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Tiber
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Castile and León, Aveiro, Porto
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Douro
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Colombia, Venezuela
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Orinoco
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Gangwon, Seoul, North Hwanghae
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Han
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Lesotho, South Africa, Namibia
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Orange
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Yunnan, Guangxi, Hong Kong
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Pearl
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Colorado, Chihuahua, Texas
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Rio Grande
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Altai Krai, Novosibirsk Oblast, Khanty-Mansi Autonomous Okrug
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Ob
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Burkina Faso, Ivory Coast, Ghana
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Volta
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New York, New Jersey, Pennsylvania
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Delaware
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Lebanon, Syria, Israel
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Jordan
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