MacMohan Line lies between which of the following countries ?

The McMahon Line is the boundary between India and China (specifically the Tibet region) in the Eastern Sector [c1][c2]. It was established during the Simla Convention of 1914, named after Sir Henry McMahon, the British representative who negotiated the agreement [c2][c3]. The line runs approximately 1,140 km from the eastern limit of Bhutan to the tri-junction of India, Myanmar, and Tibet [c2]. While India recognizes this line as its legal national border, China rejects the Simla Convention's validity, claiming that Tibet lacked the sovereignty to sign such a treaty [t4][t5]. Despite this, the line serves as the effective Line of Actual Control (LAC) in the region of Arunachal Pradesh [c3][t4]. The boundary follows the Himalayan crest of the northern watershed of the Brahmaputra River [c2].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > Table 16.2 > p. 29
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > The Eastern Sector > p. 34
3. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > The Sino-Indian Border Dispute > p. 31
4. [4] https://en.wikipedia.org/wiki/McMahon_Line