The Amazon River and its tributaries run through Peru, Venezuela, Ecuador, Bolivia, Colombia and Brazil. The river is approximately 4,000 miles long, making it the world's second longest river after the Nile. It is the largest based on watershed size and tributary number.
The Amazon River begins at a tributary known as the Carhusanta, located in the Andes Mountains of Peru. It ends by emptying into the Atlantic Ocean. The world's largest tropical rainforest can be found in the Amazon River's watershed. This area experiences high temperatures and heavy rainfall throughout the year. As of 2015, no bridge has been built across the Amazon River.