India and china
i know it is India and China and not India and Pakistan
The border between India and China is referred to as the Line of Actual Control (LAC). It is a de facto boundary that separates the two countries and is not fully demarcated or agreed upon by both sides.
That is usually known as the border.
The McMahon Line is the boundary line between India and China. It was demarcated by British diplomat Henry McMahon in the early 20th century.
Radcliffe line separates India and Pakistan
No, "border" is not a proper noun. It is a common noun that refers to the line separating two areas or countries.
The Border between the two countries separating Russia and China is just that a Border line.
A border separating two countries is called an international border or a national border.
The two countries that border Andorra are Spain and France.
The two countries that border Somalia are Ethiopia and Kenya.
The homonym for boarder is border. "Boarder" refers to someone who pays to stay in a place, while "border" refers to the line separating two countries or areas.