The National park of Marojejy stretches on a mountainous area of 600 km². The 90% of Marojejy national park is covered with original primary forests. Created in 1952, it takes a long time to be accessible to the general public. It was officially declared a UNESCO World Heritage Site on June 2007.

A non-exhaustive list of the plants reports 275 species of ferns, more than 50 species of palms. Marojejy shelters rich fauna of more than 150 species of amphibians and reptiles including 60 frogs. There are 45 mammal species, various species of lemurs. For scientist, it is also possible to find Indri, red-bellied lemur, Eastern woolly lemur, aye-aye, bamboo lemur or Weasel sportive lemur. 

This green and attractive biodiversity cannot exist without rain. In fact, Marojejy is one of the wettest regions of Madagascar and it can rain for weeks. From December to February, the rainfall can be very thick and the acess is harder. Do not forget your raincoat and warm clothes if you are not habituate to a temperature between.