Overlay Of The Contiguous United States On Top Of The Moon
A landmass of 2,959,064.44 square miles covers the contiguous United States. There would still be enough space for other countries if we laid the entire area over the moon.
The overall surface area of the moon is about 14.6 million square miles. Asia, with 17.21 million square miles of surface area, would be your best pick if you wanted to take up all of the available space on the moon.