<P> The McMahon Line is a border line between Tibetan region of China and North - east region of India, proposed by British colonial administrator Henry McMahon at the 1914 Simla Convention which was signed between the British and the Tibetan representatives . It is currently the effective boundary between China and India, although its legal status is being disputed between the Indian and the Chinese government . </P> <P> The line is named after Henry McMahon, foreign secretary of British India and the chief negotiator of the convention at Simla . It was signed by McMahon and Lonchen Satra on behalf of the Tibetan Government . It extends for 550 miles (890 km) from Bhutan in the west to 160 miles (260 km) east of the great bend of the Brahmaputra River in the east, largely along the crest of the Himalayas . Simla (along with the McMahon Line) was initially rejected by the Government of India as incompatible with the 1907 Anglo - Russian Convention . This convention was denounced in 1921 . After Simla, the McMahon Line was forgotten until 1935, when British civil service officer Olaf Caroe convinced the government to publish the Simla Convention and use the McMahon Line on official maps . </P>

Which two countries are separated by mac mohan line