In the Alaskan Wilderness on the Matanuska Glacier, a shallow supraglacial river cuts into the narrow walls of a canyon of ice, creating an steep overhang in the ice.

In the Alaskan Wilderness on the Matanuska Glacier, a shallow supraglacial river cuts into the narrow walls of a canyon of ice, creating an steep overhang in the ice. - 131701137

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