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River - Wikipedia
River - National Geographic Society
10 Most Famous Rivers In The World - WorldAtlas
Rivers | National Geographic
Understanding Rivers - National Geographic Society
National Wild and Scenic River System | Rivers.gov
River | Definition, Examples, Importance, & Facts | Britannica
Rivers, Streams, and Creeks | U.S. Geological Survey - USGS.gov
Explore Rivers of the U.S. - American Rivers
Explore rivers - BBC Bitesize