The Iron Curtain.
an imaginary line that divides territories.
It's the line (boundary) between two countries.
The boundary is known as a border between two states or countries.
China is a communist country. The cold war was between the western countries and the communist countries. China supported the communist countries.
Communist countries between Russia and Western Europe acted as a buffer between the countries.
The Warsaw Pact was the largest of several alliances of Communist countries.
great lakes
India and China
A natural boundary is often times a body of water such as a river. Between the US and Mexico, part of the boundary between these two countries is the Rio Grand River. A political boundary is one created by a treaty or some type of political agreement between two countries. For example, the Dominican Republic and Haiti are on the same island. The boundary between them is a political one established when France ruled Haiti and Spain ruled the Dominican Republic.
Lake Victoria acts as a boundary between Tanzania, Uganda, and Kenya. Another natural boundary between these countries is the Kagera River.
between Argentina and Uruaguay
Well, most of them disappeared between about 1989 and 1991. Second world countries are communist.