Siberia's western border is the Ural Mountains.
Ural Mountains are between Europe and Asia.
The mountain range that covers most of Siberia's border is the Urals. The Urals stretch from the Arctic Ocean in the north to the border of Kazakhstan in the south, dividing Western Russia from Siberia.
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.