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. 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. Subsequently, the term came to refer to the line
formed after the 1962 Sino-Indian War.
The LAC is different from the borders claimed by each country in the Sino-
Indian border dispute. The Indian claims include the entire Aksai Chin region
and the Chinese claims include Zangnan (South Tibet)/Arunachal Pradesh.