Andohahela National Park is 40kms north-west of Tolanaro and at the southern end of the Malagasy Highlands. The park is divided into three zones. The first, Malio has dense rainforest with more than two hundred species of tree ferns, orchids, wild vanilla, lemurs and many birds. The second Ihazofotsy-Mangatsiaka contains dry spiny forest with rare birds and reptiles. The third zone, Tsimelahy is mainly contained in the unique Ranopiso transitional forest and is the only place where the three-cornered palm occurs naturally. The mountains form a natural barrier to the moist trade winds that blow from the east, causing a rainfall of 1,500–2,000mm per year on the eastern side that supports one of the few rainforests south of the Tropic of Capricorn.