Srivijaya, Malacca, and Mastery of the Straits

Medieval Southeast Asia sat strategically between India and China, and the Strait of Malacca, between the Malay Peninsula and Sumatra, was one of the most vital maritime passages in the world, controlling traffic between the Indian Ocean and the South China Sea. The monsoon — a seasonal wind pattern that reverses direction according to the time of year — governed the cycles of trade across the region, and Southeast Asian political organization was often characterized by what historians call the "mandala" or "galactic polity" model: a center of power whose influence radiated outward with diminishing strength toward the periphery, rather than the fixed, clearly bordered territorial state familiar from Europe.