|- location||Indian Ocean|
|- elevation||0 m (0 ft)|
|Length||150 km (93 mi)|
|Basin||16,760 km2 (6,471 sq mi)|
The Mananara is formed by the merger of the Menarahaka, Itomampy, and Ionaivo. The Ionavio rises on the slopes of Tsimahamory peak, at an approximate elevation of 1500m. The Itomampy rises not far from the Ionaivo, about 40 km from the Indian Ocean, at approximately 1600m, and runs north until it joins the Ionaivo. The Menarahaka rises in the Andringitra massif, at approximately 2000m elevation. It is joined by the Sahambano before joining the Ionaivo.
- Aldegheri, Marius. Rivers and Streams on Madagascar, in Battistini, Rene & G. Richard-Vindard (ed.), Biogeography and Ecology in Madagascar, p. 266-67 (1972))
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