Rianila river
| Rianila River | |
| River | |
| Country |  Madagascar |
|---|---|
| Region | Atsinanana |
| City | Brickaville |
| Source | |
| - location | Fahona Massif |
| - elevation | 1,450 m (4,757 ft) |
| Mouth | |
| - location | Andevoranto, Brickaville, Atsinanana |
| - elevation | 0 m (0 ft) |
| - coordinates | 18°58′35″S 49°06′10″E / 18.97639°S 49.10278°ECoordinates: 18°58′35″S 49°06′10″E / 18.97639°S 49.10278°E |
| Length | 134 km (83 mi) |
| Basin | 7,820 km2 (3,019 sq mi) |
 Map of Malagasy rivers.
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Rianila is a river in the Atsinanana region in eastern Madagascar. It flows down from the central highlands to flow into the Indian Ocean south of Brickaville at Andevoranto. Its largest tributary is the Rongaronga, which joins it near Brickaville.
The river was previously called the Iharoka River by Western explorers (and the Jark River in a few sources).
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