Onilahy River
| Onilahy River | |
| River | |
 Onilahy River estuary
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| Country |  Madagascar |
|---|---|
| Cities | Mandrofify, Ambolofoty |
| Source | |
| - location | near Betroka |
| Mouth | Bay of Saint-Augustin |
| - location | Saint Augustin, Mozambique Channel |
| Length | 525 km (326 mi) |
 Map of Malagasy rivers (Onilahy flows from the south-central part to the southwestern coast).
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Onilahy is a river in Toliara Province, southern Madagascar. It flows down from the hills near Betroka to the Mozambique Channel. It empties at St. Augustin (23°34′00″S 43°45′00″E / 23.5666667°S 43.75°ECoordinates: 23°34′00″S 43°45′00″E / 23.5666667°S 43.75°E), and into the Bay of Saint-Augustin.
Two species of cichlids are endemic to the river basin, but Ptychochromis onilahy is probably already extinct and the remaining range of Ptychochromoides betsileanus covers less than 10 square kilometres (3.9 sq mi).
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