The equator, though imaginary, is a line that divides the Earth into two hemispheres — the Northern and the Southern. Several countries lie in both, including Brazil, Indonesia, and Uganda. To split the Earth vertically into the Eastern and Western hemispheres, we refer to the Prime Meridian — which runs through the famous Royal Observatory in Greenwich, London — and the 180th meridian, known as the antimeridian. The area east of the Prime Meridian to the antimeridian is the Eastern Hemisphere, while the rest forms the Western Hemisphere. Many major nations, such as the United States, the United Kingdom, Russia, and France, have territories in both the Eastern and Western Hemispheres . But only one country in the world — an oceanic archipelago made up of 32 atolls and one remote coral island scattered across the central Pacific — lies in all four hemispheres: north, south, east, and west. That country is Kiribati .