* Dong Nai River: originates from the northern highlands of Lam Vien (Lang Bian), southern Annamite mountains, high mountain peaks reaching over 2,000 m upstream, Lam Vien peak: 2167 m, peak Bi Doup: 2287 m , peak Butter Out: 1864 m etc .. The high ridge with steep slopes create sources from 20-25%, headwater coordinates: 1080.42'.10''E and 120.12'.10''N, altitude The average area of about 1700 m upstream (E: meridian east, N: latitude North).
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