<P> The Bhutan - India Border is the international boundary between the Kingdom of Bhutan and the Republic of India . The border is 699 km long, and adjoins the Indian states of Assam (267 km), Arunachal Pradesh (217 km), West Bengal (183 km), and Sikkim (32 km). </P> <P> The Treaty of Peace between Britain and Bhutan demarcated the border in 1865, following the Bhutan War . The boundary was further detailed and refined in the 1973 - 1984 period through talks between Bhutan and India . Remaining disputes have been minor and concern part of the border with Arunachal Pradesh, and the region between Sarbhang and Geylegphug . </P> <P> The border between Bhutan and India is the only land access into entering Bhutan, as the border with China is completely closed . The single entry point for foreign nationals is between the towns of Jaigaon in the Indian state of West Bengal and Phuntsholing, in South West Bhutan . </P> <P> The Indian government deploys 12 battalions of Sashastra Seema Bal (SSB), and 132 border posts, to guard the border on its side . The bilateral Indian - Bhutan Group Border Management and Security has been established to collaboratively assess and secure the border between the two countries . </P>

Name the states having common frontiers with bhutan