The Giant of the Park System
The largest national park in the United States is Wrangell-St. Elias National Park and Preserve, located in the state of Alaska. It is not a close contest. This single park is so vast that it is larger than Yellowstone, Yosemite, and the country of Switzerland combined.
A Land of Mountains and Ice
Wrangell-St. Elias covers more than 13 million acres of rugged wilderness. Four major mountain ranges meet within its boundaries, and the park contains nine of the sixteen highest peaks in the entire United States. More than a quarter of the park lies under glacial ice, including glaciers so large that some are bigger than entire U.S. states.
Wild and Hard to Reach
Despite its enormous size, Wrangell-St. Elias is one of the least developed and least visited of the major national parks. There are almost no roads, and much of the interior can only be reached by small aircraft or on foot. For adventurers willing to make the journey, it offers some of the wildest backcountry hiking, mountaineering, and rafting in North America. It is also part of a vast international protected area recognised as a World Heritage Site.
Source
This article was written using information from Wikipedia.