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Donnai(both: dông`nī`), river, c.300 mi (480 km) long, rising as the Da Dung in the mountains of S central Vietnam. It flows SW past Bien Hoa and joins with the Saigon River below Ho Chi Minh City to form an extensive delta on the South China Sea. There are rapids and waterfalls on its upper reaches.
a river in South Vietnam. It is about 500 km long. In its upper reaches it intersects the Di Linh Plateau and in its lower reaches, the Cambodian Plain. It flows into the South China Sea, forming a delta. There is high water in the autumn and winter. In its lower reaches it is navigable. Its waters are used for irrigation, mainly in the cultivation of rice.