Samdrup Jongkhar is the gateway of the country’s east and shares borders with Assam. It is by far the largest urban center in eastern Bhutan. Jongkhar town holds the distinct honor of being the oldest town in Bhutan. This border town is a bustling little settlement packed to the brim with shopkeepers and hawkers from across the border. Dzong at Jongkhar is known for its heritage value.