This book examines India’s Northeast borderland – strategically positioned at the confluence of South Asia, East and Southeast Asia – from the perspective of international relations. The volume interrogates the geopolitics of region-making in both colonial and postcolonial times and traces the transformation of Northeast India from a British strategic frontier into a securitised borderland. It situates the region in transnational interactions both in conflict and cooperation with its immediate neighbouring regions of China, Bangladesh, and Myanmar, especially in the context of India’s Look East/Act East policy. The volume paves the way for a new ‘region-state’ framework borne out of the constructivist worldview and offers answers to many conundrums centring border studies. It further delineates approaches to overcoming the present geopolitical and territorial challenges of India’s Northeast with a critical thrust on regional policymaking. The volume will be of interest to students and researchers in the disciplines of social sciences and humanities in India as well as South and Southeast Asia. It will be especially useful to those in politics and international relations, strategic studies, international political economy, foreign policy, development studies and regional development, besides foreign policy-makers and diplomats, development practitioners, economists and policy analysts.