Which wildlife refuge is the largest in the United States?

The Arctic National Wildlife Refuge is the largest wildlife refuge in the United States, encompassing over 19 million acres of pristine wilderness in northeastern Alaska. This expansive area is significant for its diverse ecosystems, which include coastal plains, wetlands, mountain ranges, and abundant wildlife. The refuge is home to a variety of species, such as polar bears, caribou, and migratory birds, making it a vital habitat for biodiversity.

In contrast, the other options listed are notable national parks, which, while protective of their respective environments, do not have the same land area as the Arctic National Wildlife Refuge. Each of those parks is dedicated to preserving specific natural features and recreational opportunities, but they do not serve the same broad ecological role as the refuge. This distinction emphasizes the unique contributions of the Arctic National Wildlife Refuge to conservation efforts in the United States.