Bangladesh - 4096.7 km (Assam, Meghalaya, Mizoram, Tripura and West Bengal)
China - 3488 km (Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh)
Pakistan - 3323 km (Gujarat, Rajasthan, Punjab and Jammu Kashmir, Ladakh )
Nepal - 1751 km (Uttar Pradesh, Bihar, West Bengal, Sikkim, and Uttarakhand
Myanmar - 1643 km (Arunachal Pradesh, Nagaland, Mizoram, and Manipur)
Bhutan - 699 km (Sikkim, Assam, and West Bengal, Arunachal Pradesh)
Afghanistan -106 km Pok (Jammu and Kashmir, (Pak authorized)