The third episode of Seven Worlds, One Planet focuses on the most species-rich continent on Earth - South America ... rivers combined. Scientists think the river originates in the Andes Mountains ...

South America is in both the Northern and Southern Hemisphere, with the Equator running directly through the continent. The Tropic of Capricorn also runs through South America. The Pacific Ocean ...

WWF is working on the ground in Venezuela and Colombia with local communities to protect one of South America's most important rivers.