曼戈基河（Mangoky）是马达加斯加的河流，河道全长564公里（350英哩），流入莫桑比克海峡。

马达加斯加过去40年的森林开伐，导致严重的泥土侵蚀作用，出现大量河口沙洲。

The Mangoky River is a 564-kilometer-long (350 mi) river in Madagascar in the regions of Atsimo-Andrefana and Anosy. It rises in the Central Highlands of Madagascar just east of the city of Fianarantsoa. The river flows generally in a westerly direction out of the highlands, crosses the southern extension of the Bemaraha Plateau, reaches the coastal plain and its delta, and enters the Mozambique Channel north of the city of Morombe at 21°19′00″S 43°32′00″E / 21.316667°S 43.533333°E / -21.316667; 43.533333.