The Radcliffe Line became the border between India and Pakistan on 17 August 1947 after the Partition of India. The line was decided by the Border Commissions chaired by Sir Cyril Radcliffe, who was to divide equitably 175,000 square miles (450,000 km2) of territory with 88 million people.
The McMahon Line is a line agreed to by Great Britain and Tibet as part of Simla Accord, a treaty signed in 1914. Although its legal status is disputed, it is the effective boundary between China and India.
The Stalin Line was a line of fortifications along the western border of the Soviet Union. Work began on the system in the 1920s to protect the USSR against attacks from the West. The line was made up of concrete bunkers and gun emplacements, somewhat similar but less elaborate than the Maginot Line. It was not a continuous line of defenses along the entire border but rather a network of fortified regions, meant to channel the potential invaders along certain corridors.