Conversation so far:
where does the river amazon start and end?
The Amazon River starts in Peru's Andes Mountains and ends in the Atlantic Ocean
how much area is covered by the Amazon River?
The Amazon basin is the largest drainage basin in the world, with an area of approximately 7,050,000 square kilometres (2,720,000 sq mi).

Question: what feeds the river?
Self-contained rewrite: what feeds the Amazon River?