Final answer:
The United States has the largest percentage of its land protected through a vast network of national parks, national forests, and national monuments.
Step-by-step explanation:
The country with the largest percentage of its land protected is the United States. The United States has a vast network of protected public lands, including national parks, national forests, and national monuments, which cover approximately 230 million acres of land. These protected areas are managed by agencies such as the National Park Service, U.S. Forest Service, and Bureau of Land Management to preserve their natural, cultural, and historical resources.