What is the major river that flows through the grand canyon

The Grand Colorado River

Explanation:

The state of Colorado consists of a colorado river that goes through the grand canyon. Starting from the rocky mountain region originating in the Gulf of California and entering the colorado plateau this river is 1450 miles long and drains extensively. The natural discharge rate of this river is 16.3 million acre-feet. As 90 % of the river discharge originates in snowmelt.