The Mananantanana is a river in
Haute Matsiatra
Haute Matsiatra (in Malagasy: Matsiatra Ambony) is a region in Madagascar. It borders Amoron'i Mania region in north, Vatovavy-Fitovinany in east, Ihorombe in south and Atsimo-Andrefana in west. The capital of the region is Fianarantsoa, and the ...
region, is located in eastern
Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...
. It flows into the
Mangoky River.
Fleuves & Rivières de Madagascar
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It has its springs in the Andringitra Massif
The Andringitra Massif ("desert of rocks") is a granite massif located within Andringitra National Park in Madagascar. The range is approximately long. In its central area, the range is almost wide, though it is much narrower on either end. Pic ...
. Together with the Matsiatra
The Matsiatra is a river in Haute Matsiatra region, is located in central and western Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de ...
it forms the Mangoky River.

References
Rivers of Madagascar
Rivers of Haute Matsiatra
{{Madagascar-river-stub