A drowned landmass of river deltas, coastal plains, and monsoon-fed lowlands stretching from Thailand to Indonesia. Dense wetlands in the mainland generate agrarian kingdoms and river civilizations (Khmer, Thai, Burmese), while the island zones create maritime trading polities (Srivijaya, Majapahit). The region’s geography fuses monsoon trade, rice-based agriculture, and constant cultural interchange. Civilization here is both continental and seafaring, producing the historic engine room of Southeast Asian culture and commerce.
