The area of Fox River National Wildlife Refuge is 4,265,386.6692096 square meters.
The area of Swan River National Wildlife Refuge is 7,195,310.719027201 square meters.
The area of White River National Wildlife Refuge is 647.497 square kilometers.
The area of Parker River National Wildlife Refuge is 18.866 square kilometers.
The area of Alligator River National Wildlife Refuge is 615.122 square kilometers.
The area of Crystal River National Wildlife Refuge is 80 square kilometers.
The area of Tualatin River National Wildlife Refuge is 7,510,965.5199744 square meters.
The area of Wallkill River National Wildlife Refuge is 20.639 square kilometers.
The area of Great River National Wildlife Refuge is 46.944 square kilometers.
The area of Trinity River National Wildlife Refuge is 101.171 square kilometers.
The area of Cahaba River National Wildlife Refuge is 13.816 square kilometers.
The area of Sacramento River National Wildlife Refuge is 41.059 square kilometers.
The area of Roanoke River National Wildlife Refuge is 84.895 square kilometers.