Geography has moulded Singapore's self-definition, much as it has shaped the contours of the rest of Southeast Asia, a region that lies south of China and east of India. Placed within overlapping Sinic and Indic zones, Singapore's entrepôt role has served both. Today, as China and India emerge simultaneously as rising powers, a port city is going beyond its trading role to engage them in political and security terms. This book combines diplomatic history and international relations theory to show how Singapore is facilitating China's and India's engagement of Southeast Asia.