Hydrology
Hoang Lien Nature Reserve is drained by the Muong Hoa and Ta Trung Ho rivers, which feed the Nam Po River and, finally, the Song Hong (Red) river.
The forest has an essential role in water catchment protection, particularly the forest at high altitudes, which is frequently covered in cloud. Water condenses on the vegetation and falls as ‘occult’ precipitation. Occult precipitation makes a major contribution to stream-flow during the dry season when rainfall is low.
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