Sundachina (820–963 CE): Khmer Beginnings, Bagan’s Foundations, Vietnamese Independence, and Srivijayan Exchange

Geographic Parameters

Sundachina extended from the central and southern Irrawaddy basin through Thailand, Laos, Cambodia, Vietnam, and the Malay Peninsula, and across Sumatra south of Aceh, Java, Borneo, Sulawesi, the Philippines, and the eastern archipelagos. Its principal environments included monsoon river valleys, deltas, volcanic plains, forested uplands, mangrove coasts, inland seas, and maritime straits.

Environmental Continuity

Seasonal rainfall sustained irrigated rice cultivation in the Irrawaddy, Chao Phraya, Mekong, and Red River basins, while volcanic soils supported productive agricultural districts in Java and Sumatra. Upland and island communities combined dry rice, root crops, sago, fruit trees, forest gathering, fishing, and reef use.

The monsoon also governed movement. Seasonal winds connected the Strait of Malacca, Java Sea, South China Sea, Makassar Strait, and the waters leading toward the Moluccas and the Philippines.

Societies and Political Development

The older Pyu city-states of the Irrawaddy basin declined after ninth-century warfare and disruption, but their Buddhist, agricultural, and urban traditions remained influential. Burman-speaking populations increasingly settled the central Irrawaddy plain, where the developing center of Bagan began to draw surrounding communities into a new regional network.

In Cambodia, Jayavarman II and his successors established the early Khmer kingdom, linking royal authority to sacred kingship, agricultural expansion, and control of the Tonlé Sap and upper Mekong approaches. Early capitals shifted within the region as rulers consolidated alliances and labor.

The Dvaravati cities of the Chao Phraya basin remained important centers of Mon culture and Buddhism. In the uplands of Laos, smaller river-valley and forest chiefdoms participated in exchange with Mon, Khmer, and neighboring communities.

In the Red River delta, Ngô Quyền defeated Southern Han forces at the Bạch Đằng River in 939. His victory restored an independent Vietnamese state after centuries of Chinese rule, although regional warlords continued to contest authority.

Along central Vietnam, Champa developed as a series of connected coastal centers. Cham rulers drew wealth from irrigated agriculture, forest products, seaborne trade, and control of ports linking China and the wider maritime world.

Maritime Networks

Srivijaya, centered in southern Sumatra, remained the leading commercial and diplomatic power of the Strait of Malacca. Its influence rested on alliances with ports, control of maritime passages, Buddhist patronage, and the ability to provision and protect merchants moving between India and China.

Javanese courts remained supported by intensive rice agriculture and older Hindu-Buddhist traditions. Although the great temple-building age of central Java had largely passed, courtly culture, agricultural organization, and maritime trade remained strong.

Bornean river settlements exchanged camphor, resins, gold, and other forest products. Sulawesi seafarers connected the Java Sea to the eastern islands. In the Philippines, coastal and riverine barangay communities traded gold, wax, pearls, ceramics, textiles, and forest goods.

Cloves from the Moluccas and nutmeg and mace from Banda moved through chains of local producers and maritime intermediaries rather than through a single controlling state.

Belief and Cultural Life

Buddhism remained influential among the Pyu, Mon, Srivijayan, and Javanese worlds. Hindu traditions shaped Khmer and Cham kingship, while local ancestor and spirit practices continued throughout the region. Religious institutions commonly stood within inhabited agricultural and commercial landscapes rather than apart from ordinary life.

Adaptation and Resilience

Communities relied on diversified food systems and overlapping exchange routes. Rice-growing districts were supported by canals, embankments, reservoirs, and local labor, while island populations reduced risk through fishing, arboriculture, mobility, and exchange.

Legacy of the Age

By 963 CE, Sundachina had begun a major political and commercial reorganization. Early Khmer authority was established in Cambodia, Bagan was emerging in the central Irrawaddy basin, Vietnam had regained independence, and Champa remained an important coastal power. Srivijaya continued to coordinate the western maritime corridors, while Java, Borneo, Sulawesi, the Philippines, and the eastern islands formed an increasingly connected archipelagic world.