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Sierra del Divisor

August 2005

A great expanse of sandstone mesas, ridges, and rocky towers cut off from the rest of the world, standing unexplored in the endless Amazonian lowlands, where hot, sulfurous spring bubbles up from deep underground and the mist swarms with Scarlet Macaws attracted to minerals in the water.


Locally called Siná Jonibaon Manán, the Sierra del Divisor holds incomparable diversity of geology and climate. Ancient rock formations rising up in the midst of younger formations catch thunderstorms coming off the Amazonian plains, resulting in a mosaic of rain shadows where tall humid forests stand side by side with severely stunted shrublands, and possibly unique species unknown to science.


Rapidly moving extractive activities are threatening this area, creating an immediate call to unified action to protect it. A new Zona Reservada for the region brings a unique opportunity to build on the million hectares of protected area in the Brazilian side (Parque Nacional da Serra do Divisor), allowing a future for the region and its Indigenous inhabitants.

Uplift at Sierra del Divisor_blurred

Photo by Álvaro del Campo

Full Report

Color Plates

Data Appendices

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