Book excerpt: BIMSTEC (Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation) represents one of the most diverse regions of the world. Providing a unique link between South Asia and Southeast Asia, it brings together 1.5 billion people and a combined GDP of $2.7 trillion. This volume focuses on issues related to connectivity, commerce, and security challenges facing BIMSTEC. It studies BIMSTEC’s relevance as an inter-governmental organization in the changing international milieu. The volume discusses the necessity of connectivity to enhance Bay solidarity and analyses the political, strategic and security concerns that restrain commercial connectivity. It also looks at the Bay of Bengal region as a zone of competition—and possible collaboration—between the littoral countries and major powers involved in the region. Comprehensive and topical, this volume will be an essential read for scholars and researchers of international relations, South Asian studies, foreign policy, diplomacy, Southeast Asian studies, defence and strategic affairs, maritime studies, international trade, regional cooperation, and political studies.