With which one of the following countries, India shares maximum length of the border?

India shares its longest international land border with Bangladesh, covering a total length of approximately 4,096.7 kilometers [1]. This extensive boundary is the fifth-longest land border in the world and is shared with five Indian states: West Bengal, Assam, Meghalaya, Tripura, and Mizoram. Following Bangladesh, India's next longest borders are with China (3,488 km), Pakistan (3,323 km), and Nepal (1,751 km) [1]. The border with Bangladesh is characterized by its complex geography, having been largely defined during the partition of India. While some sources provide slightly varying figures for other borders due to different surveying methods or territorial claims, the status of Bangladesh as the country sharing the maximum border length with India is consistently maintained across official and academic records [1].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 16: India–Political Aspects > INTERNATIONAL BOUNDARIES OF INDIA > p. 28