Tajikistan
The Bhutan-India Border is the international boundary and adjoins the Indian states of Assam, Arunachal Pradesh, West Bengal, and Sikkim.
The five Indian states that share a land border with Nepal are Uttarakhand, Uttar Pradesh, Bihar, West Bengal, and Sikkim.
Bangladesh and India share a 4,096-kilometer long international border, the fifth-longest land border in the world. West Bengal, Assam, Tripura, Mizoram, Meghalaya and West Bengal.