Spain
slightly more than twice the size of Oregon

Spratly Islands
NA

Sri Lanka
slightly larger than West Virginia

Sudan
slightly more than one-quarter the size of the US

Suriname
slightly larger than Georgia

Svalbard
slightly smaller than West Virginia

Swaziland
slightly smaller than New Jersey

Sweden
slightly larger than California

Switzerland
slightly less than twice the size of New Jersey

Syria
slightly larger than North Dakota