Onilahy River
The 883rd longest river in the world
Onilahy is a river in Atsimo-Andrefana and Anosy (Toliara Province), southern Madagascar. It flows down from the hills near Betroka to the Mozambique Channel. It empties at St. Augustin (23.5666667°S 43.75°E / -23.5666667, 43.75), 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 mi2).
Flows through: Madagascar.
River data from Wikidata (CC0); lengths normalised to a common unit.