In the narrow sense, it refers only to the line of control in the western sector of the borderland between the two countries. In that sense, the LAC forms the effective border between the two countries, together with the (also disputed) McMahon Line in the east and a small undisputed section in between. In the wider sense, it can be used to refer to both the western line of control and the McMahon Line, in which sense it is the effective border between India and the People's Republic of China (PRC).