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The Marojejy National Park with its heavy rainfalls has a very branched and deeply embedded river system. This corresponds to powerful mountain stream characteristics with very steep gradients and a predominance of large boulders in the river beds. This river system consists of several rivers having their source in the park, of which the eight most important are: Andranomadio, Andranomifototra, Manantenina, Sambava, Soahitra, Andrahanjo, Andalangy and Antsaberaoka.
The dominant ethnic group in the are area is [[Tsimihety]].
65km from [[Sambava]] along the tarred RN3B, the Marojejy National Park office can be found 200m before [[Manantenina]]. From thereon a 2.7km secondary road leads to the village of [[Mandena]]. From Mandena it is a 2.9km walk along a trail to the park entrance.
* It is a biodiversity hotspot and exceptional endemism with the largest number of species of reptiles and amphibians known in Madagascar.
The park also plays an economic role in the region:
* It ensures the viability of agricultural activities of the surrounding communes through the protection of soils and drainage basins.
* It is home to several rivers, of which the eight most important provide drinking water for the people of eight rural and urban communes. It is possible to water most of the 18,000ha of the Ankaibe plain if water infrastructure is properly managed.