A political entity like a country, city, county or kingdom exercises its authority over a particular area. The line which divides the land which is part of the entity from that which is not is called a border. A border surrounds the political entity on all sides, including the west. That part of the border which is on the western side is the western border. The border may correspond to a physical feature: the western border of the United States is the coast of the Pacific Ocean; the western border of Germany follows in part the course of the Rhine river.
Siberia's western border is the Ural Mountains.
The Mississippi River forms the western border of Illinois.
Cambodia is on the Vietnam western border.
Thailand lies on Cambodia's western border.
The western border of Czechoslovakia was an area known as Sudetenland.
Nebraska has a south-western border with Colorado and eastern border with Iowa.
Portugal shares Spain's western border.
Idaho's western border is 479 miles long.
California's eastern border and Arizona's western border.
It ia on the eastern border of California. The western boundary of Callifornia is the Pacific Ocean,
Damascus is the capital and largest city of Syria, the country whose western border is Lebanon.
Indiana begins at the western border of Ohio. Ohio is the western border is Pennsylvania