In ordinary people’s thinking, South Asia and Southeast Asia sound like two separate geographical regions. Indeed, not many people think they are connected. However, as Baruah (2004) points out that there are no “natural” geographical boundaries separating South and Southeast Asia along the border between India and Myanmar. Furthermore, the name of the regions themselves already indicate their linkages. Studies of archaeological facts, cultures, and arts of countries in the regions over the past decades have found early interactions between South and Southeast Asia, not just confirming their connection but constitutiveness of each other (Manguin et al. 2011). Peter Kunstadter wrote in a two-volume work that the languages used by tribes and minority groups in the northeastern borderlands of South Asia are more closely related to the languages of Southeast Asia than to those of the Indian subcontinent, and that their cultures are resembling with those of their Southeast Asian neighbours (Kunstadter 1967).