An over 8 million acres plot of mountainous country—the largest national park in the system—protects the convergence of the Alaska, Chugach, and Wrangell-Saint Elias Ranges, which include many of the continent's tallest mountains and volcanoes, including the 18,008-foot Mount Saint Elias. More than a quarter of the park is covered with glaciers, including the tidewater Hubbard Glacier, piedmont Malaspina Glacier, and valley Nabesna Glacier.