Topography and geomography : The park has a mainly mountainous relief and contains wet forests of low altitude relatively not very disturbed, ombrophilous forests and forests of the high plateau. The slope altitudinale varying from 400 to 1417 meters (1313- 4648 feet) spillplate considerably the biological diversity of the park. The two higher mountains of the area on which are located geodetic points find inside the park, namely the Mounts Maharira in the south (1374 RN or 4509 feet) and Vohidratiana in north (1316 RN or 4319 feet). The forest Covering the near total with the territory of the Park, the forest is characteristic dune wet tropical zone. Historically, the forests of the area underwent disturbances which had with the human activities which brought dimportants impacts on the composition of the forest. Since always, the culture on-brûlis tavy and collects it of structural timber in particular the species with great commercial value including the purple wood (Dalbergia sp.), the maka or bois de rose (Weinmannia sp.) and the varongy (Mespilodaphne tapack.) the greatest uses of the forest resources of the area constituted. Research carried out jusquà now brought to a very general classification of the forest based on laltitude and the forest disturbances. Indigenous Forests of the High plateau: The indigenous forests of the High plateau, located on the Western side of the Park, vary active length dune scale dhumidity of ombrophilous forests of small stature of 1100m with 1300m daltitude with the dense forests of higher altitude of 1300m with 1400m. These forests are essential with the protection of the hydrous resources, particularly those of the Namorona river which makes turn the hydroelectric power station of Ranomafana. There is commercial dexploitation little or deforestation in this area because the tavy is limited there and the plantations of pines and deucalyptus provide for the requirements out of wood. One notes labondance of Katoto and Vitanona. Forests of the Intermediate Zone: These forests located between 600m and 1100m daltitude are a mosaic of: 1) secondary forests regenerated after the tavy; 2) selectively cut down primary forests; and 3) intact primary forests. These forests are exposed to the anthropic pressures and commercial wood lexploitation or of the natural resources since the forests of the plains practically disappeared under the practice from the tavy, and that the villagers depend closely on the products of the forest for their subsistence. These forests are currently the zones having greatest biological diversity. Forests of the Lowlands: The formations primary of lowlands to less 600m daltitude and formerly located at lEst of the Park practically disappeared because of the tavy. They nexistent more than on the crowned grounds dune surface from 10 to 20 ha where the clearing is interdict according to the tradition. The secondary forests of the lowlands were reduced in small plantations of forests along the stiff edges and slopes Types of vegetation and ecosystem : The forest of Ranomafana is classified in the category of the flora under the wind; it is a wet dense forest of average not very disturbed altitude. Sometimes, one distinguishes from the ombrophilous forests and the forests of the high plateau. Five types of terrestrial ecosystem are met in the Park and the area Primary formations : Located especially in the zones of low and average altitude, presenting a formation at several layers. They are made up mainly of a series with Tambourissa and Weinmannia. They are met in selectively exploited sites or in sites not presenting any history of disturbance of the Western part, Is and Southern Park (average altitude and low altitude, namely Vatoharanana, Valohoaka, Sahavoemba, Miaranony, Ambohimila).. Secondary formations : Formations disturbed after strong exploitation or culture on brûlis, with a series with Eugenia and Harungana on average altitude and a savoka with Ravenala or unproductive pastures dominated by Aristida sp. and Imperata cylindrica in the zones of low altitude located in the peripheral zone of the Park (with less 600m). This type of forest covers a significant surface towards the East, the South and South-east of the Park. Particular formations : Formed watery ecosystem of marsh, lakes and rivers, being located in the low zones and the valleys of the Park (in Ranomena and Andranofady). This wetland is occupied particularly by pandanuses and snap rings.) Cultures and plantations : Cultures practised in the area made up of: itinerant culture on-brûlis which are the most practised form, permanent crops of revenue more or less of banana trees and coffee-trees or other food crops. Plantations of Pinus patula and Eucalyptus sp. in the zones of afforestation located at the West of the Park. Although not being inside the limit of the Park, they are significant bus satisfy the requirements out of structural timber and wood for heating for the bordering peasants . Ranomafana-Andringitra-Ivohibe Corridor : Narrow more or less degraded forest corridor, starting with the National park Ranomafana, crossing the Park of Andringitra and finishing towards the South by the Reserve of Ivohibe. It plays a significant role in the maintenance of biological diversity and the ecological stability of the two adjacent parks. Various sectors and their specificities : The Park is divided into 3 pieces shown in chart 2 attached: 1 portions out : It is the part more in North and largest with the Park, 25.260 ha cover. As it is the most distant sector, it is most intact with the human activity. This piece contains two types of primary forests. More in North is a relatively broad section of primary wet forests nondisturbed. To the South, a small section of primary wet forests not very disturbed provides a composition different of habitat which receives less precipitations and contains hundreds of species of orchises. Covered marshy formations of pandanus and snap rings are also present in this Southern part of the piece. Portions out 2 : The smallest part more in the West and of the Park covers an extent of 1.613 ha and is on the high plateau. Ombrophilous forests at high altitudes make this section. Plantations of pines and eucalypti border this piece in the West. Parcelle 3: La partie la plus au Sud s'étale sur une superficie de 13.740 ha. C'est la parcelle la plus exploitée. La grande majorité des recherches faites dans le Parc ont été menées dans cette parcelle. La principale station de recherche (Talatakely) y est construite en pleine forêt secondaire, avec deux stations satellites (Vatoharanana et Valohoaka) établies en forêt primaire. La première zone touristique s'y trouve. Il s'agit principalement d'une forêt secondaire caractérisée par l'abondance de goyaves et de bambous. D'où la facilité d'observer les lémuriens mangeurs de bambous et de goyaves. Une grande section de forêts primaires non perturbées est située dans la partie Sud dont une section au Sud-Est constitue l'unique habitat du lémurien Varijatsy (Varecia variegata variegata).