The Hoang Lien San range of mountains lies in the north west of Vietnam. The range stretches from the Yunnan highlands in China to Hoa Binh province in Vietnam, 160 km long and at its broadest 3km wide.
Hoang Lien National Park 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.
The highest post peak is Mt. Fansipan at 3140 metres and quite and arduous climb which affords a marvellous view into China and Laos and of course over north-west Vietnam.
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