Qualla: Munim River

Munim River: Introduction

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Esquilo, CC BY-SA 3.0. The Munim River is not long, by Amazonian standards. Three hundred and twenty kilometers, source to sea, drains a basin of 15,918 square kilometers in eastern Maranhão - about five percent of the state. But the Munim is the river that the eastern tablelands trust with their water. Twenty-three municipalities sit within its catchment. Seven of them lie entirely within its basin. The river rises in the *Tabuleiros* - the high, flat-topped plateaus of the Barreiras Formation - and flows roughly north-northwest through cattle country, soybean fields, and small farming towns before emptying into the Baía de São José near the state capital.

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Image: Esquilo | CC BY-SA 3.0

Munim River: Where the River Begins

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Brazil_location_map.svg: NordNordWest derivative work: Виктор В (talk), CC BY-SA 3.0. The Munim proper is born in the municipality of Afonso Cunha, at the confluence of two small watercourses called the Riacho da Barriguda and the Riacho do Bio. Its sources drain the northeastern edge of the Caxias plateau, where thin soils overlie the sandstones of the Barreiras ...

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Image: Brazil_location_map.svg: NordNordWest derivative work: Виктор В (talk) | CC BY-SA 3.0

Munim River: The Towns That Ride Along

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Esquilo, CC BY-SA 3.0. Afonso Cunha, Cachoeira Grande, Chapadinha, Mata Roma, Nina Rodrigues, Presidente Vargas, São Benedito do Rio Preto - seven municipalities lie wholly within the Munim basin, their economies built around what the river and the surrounding *tabuleiros* allow. Chapadinha is the larg...

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Image: Esquilo | CC BY-SA 3.0

Munim River: A Basin Under Pressure

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Esquilo, CC BY-SA 3.0. A 2006 study of the river around Chapadinha documented what residents had already known for decades: the Munim was being degraded. Soybean expansion had cleared forest from the riverbanks. Erosion was carrying sandy soil into the channel. Subsistence farms upstream were washing p...

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Image: Esquilo | CC BY-SA 3.0

Munim River: What Protection Exists

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Esquilo, CC BY-SA 3.0. Two conservation units now overlap the basin. The Chapada Limpa Extractive Reserve, created in 2007, covers 11,971 hectares and is a *reserva extrativista* - a protected category specifically designed to support traditional communities who make a living by gathering forest produc...

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Image: Esquilo | CC BY-SA 3.0

Munim River: A River That Still Reaches the Sea

Sat, 18 Apr 2026 00:00:00 GMT

Photo credit Esquilo, CC BY-SA 3.0. The Munim empties into the Baía de São José between the towns of Axixá and Icatu, just south of São Luís. The bay is a shallow coastal arm where freshwater meets the Atlantic, and the Munim's sediment-laden outflow helps feed the mangrove systems that line its shores. For a river...

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Image: Esquilo | CC BY-SA 3.0