Dong Nai or Donnai both: dông´nī´ [key], 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.
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