The Republic of Kiribati (pronounced "Kirr-ih-bass") is, by population, a very small nation with only 117,000 people. It consists of 33 islands, of which a third are inhabited, stretching across 2,400 miles of central Pacific Ocean near the equator and 1,300 miles along the International Date Line.
Kiribati became famous on the internet a few months ago for its unimaginative place naming practices. Yet it has another claim to fame, too. This both large and small nation is spread across four hemispheres: the northern, southern, eastern, and western. The CIA World Factbook identifies it as the only nation so endowed.
-via TYWIWDBI | Image: Google Maps
If one includes Antartica, there might be more.