After six decades of fighting glaciologist Matt Nolan created a high-resolution topographic map of the Brooks Range in Alaska, which reveals Mount Isto to be the tallest mountain in the US Arctic, standing 8,975 feet tall.

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After six decades of fighting glaciologist Matt Nolan created a high-resolution topographic map of the Brooks Range in Alaska, which reveals Mount Isto to be the tallest mountain in the US Arctic, standing 8,975 feet tall.