 Regal Mountain is the third highest thirteener (a peak between 13,000 and 13,999 feet in elevation) in Alaska, ranking just behind its neighbor, Atna Peaks.Because the mountain is almost entirely covered in glaciers, no geological studies have been done, but published references state and the geological map shows that the mountain is an old eroded volcanic edifice.Several major glaciers flow from the steep and heavily eroded flanks of Regal Mountain.