Several major glaciers flow from the steep and heavily eroded flanks of Regal Mountain. The Rohn Glacier and Regal Glacier head east and southeast to join the Nizina Glacier, while the Root Glacier flows south to join the Kennicott Glacier just above the town of McCarthy. Each of those large glaciers exceeds in width, but largest of all on Regal Mountain is a massive unnamed glacier, over across, which flows northwest just over to join the mighty Nabesna.