The Harding Icefield is actually the largest icefield within the United States, at 4,000 feet deep and sprawling across a whopping 700 square miles of Alaska’s Kenai Peninsula. And even cooler, you can actually hike up to see this goliath sheet of ice with your own eyes in Kenai Fjords National Park. Here’s everything you need to know about the Harding Icefield hike, from how to get there to exactly what you need to pack for the trail.