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).
what feeds the Amazon River?
The two most distant tributaries from the mouth of the Amazon are the Ucayali tributaries, the Apurimac and Mantaro Rivers.

Question: how much of the world's fresh water is held?
Self-contained rewrite: how much of the world's fresh water is held by the Amazon River?