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The Ardagh–Johnson Line is the northeastern boundary of Kashmir drawn by surveyor William Johnson and recommended by John Charles Ardagh as the official boundary of India. It abuts China's Xinjiang and Tibet autonomous regions.
The Ardagh–Johnson Line is one of three boundary lines considered by the British Indian government, the other two being the Macartney–MacDonald Line and a line along the Karakoram range. The British preference among the three choices varied over time based on the perception of their strategic interests in India. The Ardagh–Johnson Line represented the "forward school" that wanted to advance the boundary as forward as possible as a defence against the growing Russian empire. Following the Chinese reluctance to acquiesce to the more conservative Macartney–MacDonald Line, the British eventually reverted to the forward line in the Aksai Chin area, which was then inherited by the independent Republic of India.