The Đồng Nai River is a river in Vietnam that originates in the Central Highlands region of the southern portion of the country. It is approximately 586 km in length, making it the longest river to be entirely located in Vietnam. It gives its name to Đồng Nai Province.

The Central Highlands, South Central Highlands, Western Highlands or Midland Highlands is a region located in the south central part of Vietnam. It contains the provinces of Đắk Lắk, Đắk Nông, Gia Lai, Kon Tum, and Lâm Đồng.