Line of Actual Control
The Line of Actual Control (LAC), in the context of the Sino-Indian border dispute, is a notional demarcation line that separates Indian-controlled territory from Chinese-controlled territory on their mutual border. The concept was introduced by Chinese premier Zhou Enlai in a 1959 letter to Jawaharlal Nehru as the "line up to which each side exercises actual control", but rejected by Nehru as being incoherent.