The size of Valinor is not specified in the text, and Tolkien created no detailed maps of Aman. The maps of Karen Wynn Fonstad, based on Tolkien's rough sketch of Arda's landmasses and seas, show Valinor about 800 miles wide, west to east (from the Great Sea to the Outer Sea), and about 3000 miles long north to south - similar in size to the United States. The entire continent of Aman runs from the Arctic latitudes of the Helcaraxë to the subarctic southern region of Middle-earth - about 7000 miles.