Qualla: Campo de Perizes

Campo de Perizes: Introduction

Sat, 18 Apr 2026 00:00:00 GMT

The soil here is wrong. Campo de Perizes is a fluvial-marine plain sprawling across the land bridge between the island of Upaon-Açu - where São Luís sits - and the Brazilian mainland. For thousands of years, the Atlantic has advanced and retreated across this floodplain, leaving behind ground so soft and so saline that ordinary engineering fails here. When Brazil decided to duplicate the BR-135 highway across this terrain in 2012, the engineers could not simply lay asphalt. They had to rebuild the earth beneath it, driving 18,000-meter columns of gravel into the plain at 2-meter intervals to depths of up to 18 meters. It was the first time the technique had been used on a long stretch in Brazil. The project cost R$503 million. Some of it, inevitably, started to sink anyway.

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Campo de Perizes: A Plain That Was Once the Sea

Sat, 18 Apr 2026 00:00:00 GMT

Campo de Perizes is not quite land and not quite ocean. It is a halophilous floodplain - vegetation adapted to salt - stretched between São Luís, Bacabeira, and Rosário, shaped by the Golfão Maranhense and the Baixada Maranhense region over millennia of marine transgression and r...

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Campo de Perizes: The Bridges Over Nothing

Sat, 18 Apr 2026 00:00:00 GMT

The infrastructure crossing Campo de Perizes looks disproportionate to the land beneath it. Four distinct bridges span the channels and soft terrain: the entrance and exit bridges of the BR-135, the Benedito Leite Metallic Bridge belonging to the São Luís-Teresina Railway, the du...

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Campo de Perizes: Mangroves and Brackish Life

Sat, 18 Apr 2026 00:00:00 GMT

The coast of Maranhão contains one of the largest contiguous mangrove systems in the world, and Campo de Perizes sits squarely within that ecology. Mangroves are one of the few plant communities that tolerate salt water directly at their roots, and their tangled aerial root syste...

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Campo de Perizes: Building a Road on Soup

Sat, 18 Apr 2026 00:00:00 GMT

The engineering challenge of crossing Campo de Perizes is hard to overstate. Soft, waterlogged, saline soil does not support highway loads. When the BR-135 duplication project began in 2012, the engineering team turned to stone columns - vertical shafts of compacted gravel instal...

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Campo de Perizes: The Protected Area That Isn't Enough

Sat, 18 Apr 2026 00:00:00 GMT

Campo de Perizes falls within the Upaon-Açu/Miritiba/Alto Preguiças Environmental Protection Area, a sprawling reserve created to preserve the region against the pressure of anthropization - a word environmental planners use when they do not want to say development. The pressure ...

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