Onilahy River

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Onilahy River
JNB-MRU 22.08.2009 13-16-31.jpg
Onilahy River estuary
Country  Madagascar
Cities Mandrofify, Ambolofoty
 - location near Betroka
Mouth Bay of Saint-Augustin
 - location Saint Augustin, Mozambique Channel
Length 525 km (326 mi)
Madagascar rivers.svg
Map of Malagasy rivers (Onilahy flows from the south-central part to the southwestern coast).

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°E / -23.5666667; 43.75Coordinates: 23°34′00″S 43°45′00″E / 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[1] and the remaining range of Ptychochromoides betsileanus covers less than 10 square kilometres (3.9 sq mi).[2]


  1. ^ Stiassny, M., and Sparks, J. S. (2006). Phylogeny and Taxonomic Revision of the Endemic Malagasy Genus Ptychochromis (Teleostei: Cichlidae), with the Description of Five New Species and a Diagnosis for Katria, New Genus. American Museum Novitates 3535.
  2. ^ Loiselle, P. & participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop 2004 (2004). "Ptychochromoides betsileanus". IUCN Red List of Threatened Species. Version 2011.1. International Union for Conservation of Nature. Retrieved 14 July 2011.