Great Sand Dunes National Park and Preserve is 5.3 times larger than Provo, Utah.
Area: 606 km2 calculated
Great Sand Dunes National Park and Preserve is a United States National Park located in the San Luis Valley, in the easternmost parts of Alamosa County and Saguache County, Colorado, United States. Wikipedia
Area: 114 km2 calculated
Provo is the third-largest city in the U.S. state of Utah, located about 43 miles south of Salt Lake City along the Wasatch Front. Provo is the largest city and county seat of Utah County. It lies between the cities of Orem to the north and Springville to the south. Wikipedia