Its the worlds biggest because of the volume of water carried. It is not the longest.
The St. Lawrence River http://en.wikipedia.org/wiki/St._Lawrence_River
the worlds biggest yoyo is about the size of a hobo
The Amazon is the worlds biggest rain forest
The Catholic Church is the biggest charity in the worlds.
The worlds biggest island is clearly Green Land its PNG
The worlds biggest selling drink is both Milk and water.
The worlds biggest tin sheep here
the worlds biggest volcano is Mauna Lao is in Hawaii
James river is NOT the biggest river
The worlds longest river, the Nile, is in Africa
The worlds biggest pyrmiad is in egypt.It is among the seven wonders of world