The Udzungwa Mountains contain the largest blocks of moist forests and the greatest amount of biodiversity in the Eastern Arc.
It is one of the most important areas in Africa for primate conservation. Uzungwa Scarp FR, in particular, hosts endangered and endemic forest mammals, namely the Sanje mangabey (only found there and in the northern Mwanihana forest), Udzungwa red colobus and Abbott’s duiker, as well as several other vertebrates. Some of these are also found in Iyondo forest, the nearest forest to the north linked to USFR by the Mngeta corridor.
Reports of Sanje mangabeys in Iyondo forest have not yet been confirmed but would support the hypothesis that the two forests were once more widely connected.
Ever-increasing, documented rates of human immigration in the southern Kilombero valley in search of land for farming represent the most serious threat to the persistence of the Mngeta corridor.
With the Kilombero valley being progressively saturated it is likely that the number of people settling in the corridor area will increase, which will rapidly diminish the chances of protecting the area.
Protection of the Mngeta Corridor, along with more efficient management of Uzungwa Scarp, was one of the key recommendations that the Government endorsed following the Udzungwa stakeholders’ meeting held in 2007.