The massif extends generally northeast–southwest, with steep slopes incised by stream valleys.
[1] The southeastern slope receives more orographic precipitation than the surrounding region, and the higher rainfall sustains subhumid forests.
Analavelona is home to plants and animals characteristic of the subhumid forests, as well as some endemic species found only on the mountain.
The varied elevation, climate, and soil composition on the massif supports diverse plant communities.
The humid evergreen forests are tall and stratified, and canopy trees include species of Uapaca and Dalbergia, with abundant lianas and strangler figs.
Dense sclerophyllous montane forests are found on the plateau and upper slopes, and generally have an open understory.