Which Indian state is surrounded by three countries?

There are 3 Indian states which share international boundaries with 3 countries.They are 

• Sikkim – Bhutan in the east, China in the north and Nepal in the west.
• West Bengal – Bangladesh in the east, Nepal in the north and Bhutan in the northeast.
• Arunachal Pradesh – Myanmar in the east, China in the north and Bhutan in the west.

Further Reading:

• Political Map of India
• List of Basic Information about India