Nosivolo River | |
---|---|
Location | |
Country | Madagascar |
Physical characteristics | |
Source | |
• elevation | 1,800 m (5,900 ft) |
Mouth | |
• location | Mangoro River |
• coordinates | 19°55′41.552″S48°30′6.566″E / 19.92820889°S 48.50182389°E Coordinates: 19°55′41.552″S48°30′6.566″E / 19.92820889°S 48.50182389°E |
• elevation | 700 m (2,300 ft) |
Length | 130 km (81 mi) |
Basin size | 3,585 km2 (1,384 sq mi) |
Designations | |
---|---|
Official name | Rivière Nosivolo et affluents |
Designated | 17 September 2010 |
Reference no. | 1916 [1] |
The Nosivolo River is a river in eastern Madagascar and a primary tributary of the Mangoro River. It begins east of Fandriana. [2] [3] The village of Marolambo, capital of the Marolambo District in the Atsinanana region, is located along the river at the junction with the Sandranamby River.
It is an important river in Madagascar due to its biodiversity (including the cichlids Katria katria and Oxylapia polli , and Malagasy rainbowfish), which has spurred efforts to protect it. It was designed the first river Ramsar site in the country in 2010. [4] [5] [6]
The primary tributaries of the Nosivolo are the Sandranamby River (which joins near Marolambo), Sahadinta, Manandriana, and Sahanao. [6]
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Oxylapia is a genus of freshwater fish in the family Cichlidae. It contains the single species Oxylapia polli, known locally as the songatana. It is an endangered species, endemic to the Marolambo Rapids in the Nosivolo River in east-central Madagascar. It is threatened by habitat loss and sedimentation caused by deforestation. The only other monotypic cichlid genus in Madagascar is Katria, and it is restricted to the same region as Oxylapia. In 2010, the Nosivolo River was designated as a Ramsar Site. The Oxylapia is the conservation flagship species for the district capital Marolambo.
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