Zahamena National Park

Overview

Zahamena National Park is one of Madagascar’s largest and least fragmented blocks of eastern rainforest, and forms part of the UNESCO Rainforests of the Atsinanana World Heritage site. Straddling the Alaotra‑Mangoro and Atsinanana regions, it protects a full altitudinal gradient of humid forest, from foothills near Lake Alaotra up to rugged montane ridges.

Geography and landscape of the park

• Location: east of Lake Alaotra, north‑east of Moramanga, south‑west of Toamasina/Tamatave
• Area: ~64,000 ha of national park plus an adjacent strict nature reserve
• Elevation: approx. 400–1,500+ m
• Terrain: steep hills, narrow ridges, deep valleys, many slopes >30%
• Climate: very humid, with heavy rainfall most of the year, peaking November–April

The park is dominated by densely forested hills and mountains cut by fast‑flowing rivers, waterfalls and gorges, with occasional long‑distance views towards the Alaotra basin.

Ecosystems and habitats

• Lowland and mid‑altitude evergreen rainforest (400–1,200 m)
• Montane rainforest (>1,200 m) with shorter, moss‑covered trees and abundant epiphytes
• Rivers, cascades, forested wetlands and small montane bogs

This vertical continuum makes Zahamena an important ecological corridor between the Alaotra catchment and the eastern humid escarpment.

Trails and circuits

There is no formal tourist trail network; itineraries are built with Madagascar National Parks and guides based around Ankasy:

• Multi‑day treks from Ankasy:
  • 3–7 day treks with village or tented overnights, penetrating deep into primary forest.
• Ridge routes:
  • Technically demanding hikes along narrow ridges, giving wide views and access to relatively undisturbed forest blocks.
• Valley and river exploration:
  • Descents into forested valleys, repeated river crossings, visits to waterfalls and natural pools.

Trails are steep, muddy, slippery and unmarked; experienced local guides and porters are essential.

Wildlife

Zahamena National Park supports rich eastern rainforest wildlife:

• Lemurs: brown lemurs (Eulemur spp.), sifakas, woolly lemurs (Avahi), mouse lemurs (Microcebus), dwarf lemurs (Cheirogaleus).
• Birds: high diversity of eastern endemics (vangas, couas, ground‑rollers, mesites, forest weavers), several globally threatened species.
• Reptiles and amphibians: chameleons (Calumma, Brookesia), forest geckos, non‑venomous snakes; numerous rainforest frogs (Boophis, Mantidactylus, Guibemantis…), many micro‑endemic.
• Small mammals: tenrecs, endemic rodents, forest bats.

Flora and vegetation

Zahamena’s flora is typical of eastern humid forests:

• Lowland rainforest with tall canopy trees, lianas, tree ferns and dense understorey
• Mid‑altitude and montane forest with shorter trees, closed canopy, and high epiphyte loads (orchids, bromeliads, mosses, lichens)
• Montane wetlands and ridge clearings with shrubby, wind‑tolerant vegetation

The forest structure in the park’s core remains largely intact, with multiple strata and a closed canopy over wide areas.

Ecological and cultural importance

• Conservation: Zahamena National Park is a critical stronghold for threatened lemurs, birds and amphibians of Madagascar’s eastern rainforests.
• Hydrology: its forests feed several catchments that supply water to villages and rice fields in the Lake Alaotra region and beyond.
• Local communities: Betsimisaraka and other communities around the park depend on forest and water resources; community‑based management and alternative livelihood projects are being developed with MNP and NGOs.

Conclusion

Remote and logistically demanding, Zahamena National Park is one of the last places where a large, continuous block of eastern montane rainforest can be explored. For committed trekkers, naturalists and researchers, it offers a deep, rarely matched immersion into Madagascar’s humid interior forests.