Facts About Alaska Facts About Alaska Mountains Of the 20 highest peaks in the United States, 17 are in Alaska. Denali, the highest peak in North America, is 20,320 ft. above sea level. Denali, the Native Alaskan name for the peak, means "The Great One." Water Bodies The Yukon River, almost 2,000 miles long, is the third longest river in the U.S. There are more than 3,000 rivers in Alaska and ...