Other
River Systems of the World
Find statistics about the many river systems of the world. Includes facts such as length, drainage area, cities, notable tributaries, and more. Also provides links to sites about some of the rivers.
Encyclopedia Britannica
Encyclopedia Britannica: Uruguay River
Basic information on the Uruguay River in South America.
Science Struck
Science Struck: Widest River in the World
Explains why the Amazon River should be considered to be the widest river in the world, rather than the Rio de la Plata, also in South America.