You have to look in the Guiness book of records to find out or go on www.ask.com.
The largest known river basin in the United States is the Mississippi
The Ganges River has the largest river basin at about 2500 km long.
It's actually the Mississippi River basin.
The Nile basin is the largest basin in the worldthe area issquare km:- 3254555square miles:- 1256591
What is the largest drainage basin in the US?
What is the largest drainage basin in the US?
Ganga-Bhramputra river basin
What is the largest drainage basin in the US?
Amazon River
James River
i think it is godavari
the river Severn