TheMangoky River is a 564-kilometer-long (350 mi) river inMadagascar in the regions ofAtsimo-Andrefana andAnosy. It is formed by theMananantanana and theMatsiatra. Another important affluent is theZomandao River.
It rises in theCentral Highlands ofMadagascar just east of the city ofFianarantsoa. The river flows generally in a westerly direction out of the highlands, crosses the southern extension of theBemaraha Plateau, reaches the coastal plain and its delta, and enters theMozambique Channel north of the city ofMorombe at21°19′00″S43°32′00″E / 21.316667°S 43.533333°E /-21.316667; 43.533333.
Most of Madagascar has undergone seriousdeforestation during the last 40 years, chiefly fromslash-and-burn practises by indigenous peoples. This loss of forest has led to extremesoil erosion in the Mangoky River basin, as evidenced by the manysandbars located within the river channel. Silt-laden, greenish-tanLake Ihotry is clearly discernible south of the river. Between the lake and the coast is a rather large, whitish area of sand interspersed with silt-laden ponds. The southern portion of the delta is dominated by successive barrier island and spit formation. In contrast, the northern, protected portion of the delta is dominated by tidal passes andmangrove swamps.
Plans for a Mangoky river bridge on theRN 9 began in 2020. It will be the longest bridge of Madagascar at 880 m.[1] It will be built by theChina Road and Bridge Corporation.[2]
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