[{"n": "Rhine", "u": "/e/rivers/rhine/", "s": "Europe's second-longest river, flowing from the Swiss Alps to the North Sea."}, {"n": "Rio Grande", "u": "/e/rivers/rio-grande/", "s": "The Rio Grande: a vital, arid-land river forming the U.S.-Mexico border."}, {"n": "Rio Negro (Amazon)", "u": "/e/rivers/rio-negro-amazon/", "s": "The largest blackwater river in the world, a dark-tea-colored tributary of the Amazon."}, {"n": "Salween River", "u": "/e/rivers/salween-river/", "s": "A Southeast Asian river flowing from the Tibetan Plateau to the Andaman Sea, known for its rugged canyons, eco"}, {"n": "Senegal River", "u": "/e/rivers/senegal-river/", "s": "A 1086 km West African river forming part of the Senegal-Mauritania border, with a rich history as the 'River "}, {"n": "Songhua River", "u": "/e/rivers/songhua-river/", "s": "Longest tributary of the Amur River in northeastern China."}, {"n": "St. Lawrence River", "u": "/e/rivers/st-lawrence-river/", "s": "Major North American river connecting the Great Lakes to the Atlantic Ocean."}, {"n": "Syr Darya", "u": "/e/rivers/syr-darya/", "s": "Central Asian river, historically the Jaxartes, vital for irrigation."}, {"n": "São Francisco River", "u": "/e/rivers/s-o-francisco-river/", "s": "Longest river entirely in Brazil, vital for integration and semi-arid region."}, {"n": "Tigris", "u": "/e/rivers/tigris/", "s": "Eastern great river of Mesopotamia, flowing through history."}, {"n": "Ubangi River", "u": "/e/rivers/ubangi-river/", "s": "Central African river, largest right-bank tributary of the Congo."}, {"n": "Ural (river)", "u": "/e/rivers/ural-river/", "s": "River forming the Europe-Asia boundary, third-longest in Europe."}, {"n": "Uruguay River", "u": "/e/rivers/uruguay-river/", "s": "Major South American river forming parts of three national borders."}, {"n": "Vistula", "u": "/e/rivers/vistula/", "s": "Poland's longest river and a national symbol of cultural identity."}, {"n": "Volga", "u": "/e/rivers/volga/", "s": "Europe's longest river, flowing through Russia into the Caspian Sea."}, {"n": "White Nile", "u": "/e/rivers/white-nile/", "s": "Longer but less voluminous tributary of the Nile."}]