Yukon River outside of lunch stop at Minto. It is 1,980 miles long, and the average flow is 227,000 ft³/sec and the total drainage area is 321,500 mi².... By comparison, the Mississippi-Missouri River system is 3,710 miles long and averages from 200 to 700 thousand cubic feet of flow/sec. Yukon means "great river" in Gwich'in. The source of the river is located in BC, Canada....It gives its name to Yukon territory. The lower half of the river lies in...Alaska. The river is 1,980 miles long and empties into the Bering Sea at the Yukon-Kuskokwim Delta.