Bhutan–India border
The Bhutan–India border is the open international border separating the Kingdom of Bhutan from the Republic of India. The border is 699 km (434 m) long, and adjoins the Indian states of Assam (267 km; 166 m), Arunachal Pradesh (217 km; 135 m), West Bengal (183 km; 114 m), and Sikkim (32 km; 20 m).